Looky here y'all.
Nintendo and 3rd party devs refuse to comment/haven't commented on the system yet, nor announced/teased any games because the console is still being revised, assessed, meddled with.
Nintendo clearly learnt a few lessons from the 3DS launch and the confusion (ugh) at E3 earlier in the year, and thus I believe they have decided to keep the system under wraps until they are confident with showing it to the public again.
Right now, devs are hard at work keeping up with the SDK iterations and changes, and all WiiU games will definitely still be in development, many in early stages.
Nintendo are tweaking both the console and controller to try and deliver the best experience possible come launch. We already know they've revised the Upad/system to an extent so that the possibility of 2 remotes is now available.
They'll have taken feedback from studios around the world in an attempt to tailor the machine to meet their needs. Lil' bit more RAM here, increasing CPU speeds here.
At E3 2012, you will all see a newer, more definitive console - the Upad will be different, the console will be different, the games will be different.
For now, Nintendo are tight lipped whilst they get things sorted.
The more confident they become, the more information we'll hear form them, and the more 3rd party developers will be allowed to say.