If you look at the history of Nintendo and their consoles, you see that they tend to release new consoles that lag behind in technology, them release newer consoles only a few  years down the road ( see Gameboy Color, followed by Gameboy Advance, then DS all coming out roughly in the space of five years).

This console gen they discovered that a new console aimed at the right audience ( largely nongamers) and at the right price can become a fad and make them a lot of profit in the short run but be doomed to failure in the long run.  See Wii's position in the marketplace the last two years since it simply didn't have the hardware to compete with Microsoft's Xbox 360 and Sony's Playstation 3.

More than likely we will see a similar situation occurring in the next two years when Sony and Microsoft release their new consoles.  Wii U ( which has already shown that it doesn't have the same level of demand that the Wii and 360 had at their launches) can conceivably do well against Microsoft and Sony's upcoming consoles in its first year as it will be getting by on ports from the 360 and PS3 during the short term whereas Microsoft and Sony's next consoles' lineups may not be all that impressive at launch.  However by the Second Christmas for the follow ups to the Playstation 3 and Xbox 360 all the True flashiest and most anticipated next gen games will be launching for 720 and PS4 and the vast majority of them will be far superior to any Wii U versions in much the same way that 360 and PS3 versions were to their Wii counterparts (the few that were released).  Yet with more consumer friendly pricepoints for their new consoles than their predecessors had in addition to still maintaining the power to make Wii U look as obsolete as 360 and PS3 made the Wii look, market penetration of the 720 and PS4 will be much more rapid than it was for 360 and PS3.

In effect, Christmas 2014 will be in favor of 720 and PS4 versus Wii U just as much as Christmases 2011 and 2012 were for 360 and PS3 versus Wii.

So, do you expect Nintendo to launch the successor to Wii U in 2015?

No, not until 2017 at the earliest

New DS will be announced this year, that's what I think, they seem to go with it every 2-3 years.

DS (2004)
DS Lite (2007)
DSi (2009)
3DS (2011)

No. Just no.

There is so much wrong with this post my head almost exploded.

I think it makes sense for Nintendo to release a new home console all 5 years. Sony and MS might give their consoles some extra years before pushing out a new one though, so I expect to see more Nintendo gens than Sony/MS gens in the future.

There are two possible ways for Microsoft and Sony next-gen:

1: They will release an ultra powerful console, therefore so expensive no one's gonna buy it, certainly not in these days. Also, powerful consoles demand for beautiful games which are too expensive for most companies nowadays to make a profit on it.

2: They will release a more casual platform with forced casual games and accessories like the Kinect and Move. But casual gamers already lost interest in gaming after the Wii. Also not gonna work for them.

The second option is more possible because Microsoft/Sony lost more money than they earned with PS360.
Either way, Wii U won't suffer from not getting third party ports like the Wii did. The Wii U will probably be the only true GAMING-console and sell the most (again). Wii U isn't going anywhere anytime soon.

My most extreme prediction: Sony going all the way casual, with more gimmicky's than Nintendo did with the Wii. Sony is in a very bad financial position right now and can't afford risks with the PS4 being a powermonster.

stopped reading at "fad" .. the rest of whats written is probably full of fail fanboy wishlist.

The only way Sony can keep their core audience ( that isn't made up by acolytish fanboys like the Nintendo crowd that doesn't care what Nintendo does as long as Nintendo is #1) is to release a console that is at least as powerful in comparison to the Wii U as Vita is to 3DS and they'll try to release it for $400.00.

Moderated,

-Mr Khan

You forgot about the DSi XL and 3DS XL (the latter of which they released just a few months ago).

OT: lmao. There's so many things wrong with the OP it's not even funny.