This is Nintendo we're talking about, there's a pretty good chance it'll be bumped from next March to next holiday season. They have a pathological inability to deliver things on time.

How will they use the SCDs of others if they were already using it? And considering the reach of most system and connection speeds without cables I'm very skeptical of the usability

NX will be home console and server,  it need to be turn on all time... 

If you use it 4 hours by day,  NX could given 20 hours to the networks.  So more then 80% could be used by Community. 

Whilst I agree with you, that would kill the machine quite quickly. The Neo and Scorpio will be out by holiday 2017 and probably packing way more power compared to NX. Not to mention all the heavy hitter AAA third party titles(COD, Battlefield, Fifa, etc) that come out during that time. And all the disgruntled Nintendo owners who have not only been waiting for the NX, but have had to deal with an almost 2 year drought for the Wii U(by then).

It wasn't that immediatily. Move is a direct rip-off, but it arrived 4 or 5 years latter. Kinect isn't a copy because it is a much more advanced concept and, honestly, a technological triumph. That thing is really innovative and cannot be considered a copy.

I also don't see how skipping E3 would really help. It's only 9 months until March. It's not like anyone could release something before the NX, unless the idea is actually way simple and can be copied in no-time. In this case, it wouldn't also help to delay the announcement. It's PR BS at its best.

I see three explanations here:

1 - They want an Apple-like reveal, closer to the actual release so they can build hype quickly and keep it that way.

2 - One or more of the big reveal games aren't ready to be shown, so they would rather wait and announce everything at once.

3 - There's still something lacking in the NX itself, most likely some minor detail like the appearance of the console or controller, name, logo, etc.

err. Psye?

You are just ignoring that for close proximity (because you really don't want to use a sytem in Japan to power one in Mexico) the peak usage will have most users playing and very few system to give extra power to them, and in other hours you would have like 20 free HW for each in use... Will your game have that much flexibility in processing? I doubt so, another thing, you'll still have all the network limit problems. How much do you expect to transfer over network on a 1Mbps connection (and a lot of places don't even have it).

It is much much more cheaper at the moment to make every single HW strong enough than to design the infraestructure to warranty stability to really improve the power of each system.

The only feasible way at the moment is complete cloud computing and only a end user box to receive and present the data. That box would receive inputs from control and a "streaming movie" from the cloud but to off load computation would be very problematic.

I repeat, if Sony opted for full streaming and MS wasn't able to really put cloud to good use why do you think that Nintendo (who have very weak network footprint and experience) would be able to make it happen in the way you are assuming it will?

Besides Eyetoy being in PS2 and SixAxis already having motion sensor embebed on it what do you have to say Move is a rip-off? Just the input form being similar? So is every controller since the first one a direct rip-off?

For all those asking why they didnt show at E3, I've got another theory:
Its simply not ready yet.
Here is what I believe could have happened:

• End of 2012: Wii U is released. Sales are mediocre at best, but no one is actually worried. They still have a whole year.
• Beginning to mid 2013(?): First concepts for the next home console are made, but progress is slow. With the Wii U just out there is no need to hurry.
• End of 2013: Xbox One and PS4 are released, the latter is a huge success quickly surpassing the Wii U and leaving its competition in the dust, despite possible problems in form of the blue light of death and the playroom scandal.
• Mid 2014: Crisis at Big N: Despite several well received high profile games like Pikmin 3, Mario 3D World and Mario Kart 8, not to mention a price drop, new bundles, special offers, and a incredibly well received E3 showing the Wii U is hardly gaining any steam. The possible need to release the next console much earlier is considered for the first time.
• End 2014: Crisis part 2: Despite more great games and other trys to winning over consumer, its become obvious that the Wii U has no chance against the competition. Project NX is accelerated and revised to make sure the mistakes of the Wii U will not be repeated, simultaniously other Buisness opporturnities are sought after to stabilize Nintendo (Mobile, Movies, Theme Parks, etc...)
• Beginning of 2015: While announcing there partnership with DeNA Nintendo also announces work on NX, at that point probably just past final prototyping.

Let's crunch some Numbers:
In general a console needs at least 4-5 years from concept to product, often longer! Even in the best scenario NX has been in development for just a bit longer than 3 years, likely with several radical revisions and changes along the way. While the schedule was likely revised for the shorter timeframe as well, there are still the games. A good, solid AAA game takes at least 3 years. And we are talking about Nintendo AND new hardware here!
Yes, they probably took some Wii U games and started developing them for NX instead, but in the same time they still needed to make games for Wii U, 3DS and now mobile too, all the while keeping NX as secret as possible.
In case you havent noticed: Thats a ton of work to do in three short years!
Its very likely that there is still lots to do!

All this is even more interesting if you consider one of the Wii U's biggest failures: Its catastrophic first impression upon consumers.
"What is this? Another Wii Add ON? Some HD Handheld? A Nintendo tablet?"
Nintendo is aware of how badly they screwed up back then.

The obvious lesson is to make sure that this time, the first impression is a good one, like the PS4 did it back in 2013!

So the reason why we didnt see NX at E3 was likely that Nintendo still isnt confident that it will deliver a worthwhile first impression, and wasnt ready to risk a repitition of Wii U @ E3 2012.

Kinect projects IR laser on the room to create a full 3D map of the enviroment and the player. If you mess with its APIs, it can do a lot of stuff in the field of computer vision. PS Eye is a traditional camera, but with 120 fps capture and directional mic. Kinect was also heavily used in scientific research because it does things that were previously only available on expensive devices or that demanded a lot of computing power. It is quite brilliant on its own.

It's like saying that a motorcycle is just the copy of a bike because both have two wheels.

Not really, not even close, but you can believe whatever you want.