Putting aside what I consider to be a weird layout (and I'm fine with going between the analog stick differences between a 360 controller and Dual Shock controller mind you), I really just don't see how this spells any good news for Nintendo if they were "forced" to create this controller.
I mean, initially, if I recall, we were being told the regular screen controller would work just fine for traditional game controlling schemes, apparently not well enough or this wouldn't exist. Unless Nintendo stipulates that if someone has a regular Wii-U screened controller in their hand then the screen is not allowed to be blank or unused.
Even then, that this exists just tells me that they weren't able to get enough third parties to jump on board with that stipulation and support the console with ported software that would be popular. Even then, if this is basically to make it more port friendly, what does that by them? A year, a year and a half maybe of ports where they have somewhat of a graphical advantage, and maybe not enough of a graphical advantage to make someone feel the need to buy the Wii-U for those somewhat superior ports when they can play them on hardware they already own. Even that advantage will be gone as soon as either MS or Sony release their next consoles, so I don't see how this buys them any credence with the "hardcore" in that case, because they'll just get them on the consoles with more capable hardware at that point.
I'd have felt better if they'd shrunk the screen size on the tablet controller and beefed it up so it had more of the ergonomics of a traditional controller. I think that would have been better. This just feels like its drawing away from the central focus of the machine - whatever that really turns out to be.