1 - launching same year is a first for Nintendo, you're right. It was also a first for MSony this gen. Plus Nintendo has a history of stating they don't like providing too much info too early. So this is a logical end result.

2 - My comparison between Nintendo's historical launches was not "in same year" but rather a point that they show some basic info at one point, then at E3 in year of launch have large blow out of all details.

3 - I think you fail to see Nintendo's long-term goals wiht DeNA. They are not just putting some new IPs on DeNA platform. DeNA will become a large partner on NX platform as well. Otherwise NX has no purpose being mentioned in the press release. Its a whole platform where games will co-exist on all three environments: dedicated home console, dedicated portable console, and smaller/cheaper versions on mobile plus uniquely created DeNA IPs available in NX eShop. Biggest win is that the backbone of the system will allow DeNA (and likely other mobile game creators) very simple/quick ports from mobile. (no need to buy another tv box or play via phone/tablet if you don't want to)

4 - Plenty of evidence. Just have to widen your point of view.

I'll avoid the other points because keep discussing that won't bring us anywhere.

And in regards to DeNA and NX, we just see that conference from two different points of view. For you, the mention of NX was completely intentional and had the purpose to "hint" that whatever NX is, DeNA will take a bigger role than we think, being in of the principal providers of content.

For me, the reveal of NX was a necessity to reassure everybody that Nintendo was not leaving the hardware business, and I believe that they would have kept is secret if they could. I also see the DeNA partnership differently from you. The way I see it, that join venture has two principal goals: the first one is to give Nintendo access to the mobile games segment (something that Nintendo ha done because of pressure of its investors and because they felt it was inevitable, so better do it their own way) and the second one is to get help to develop their own account system (about time!) from someone who already has done it. DeNA fitted those goals perfectly, so that's why they went with them.

And in regards to how big will their role be in providing NX with games, given that we still don't know what NX will be about or what hardware it will have (I'm still having problems believing that it will be some kind of fusion platform because that would imply an ARM CPU for a home console, and given the hard time everybody has on PS4/X1 with a low power x86 processor that is miles more powerful than a regular ARM processor, that doesn't inspire confidence), I'm not going to make any guesses.

I totally agree with all you wrote, chances are much bigger that NX is 2017. thing.

I wasn't expecting it to get revealed at E3 anyway.