I'm hoping the Wii-U has better online such as DLC content and such, to be completly honest, it's bad enough that the Wii-U doesn't already support a DVD function, much less Blu- Ray support, the technology is pretty much at least a decade old so I don't really see why it would be an issue, aside from slashing budget costs of course.
Ok, as for the online part, Nintendo definetly needs to have better online support meaning no lag, I believe if it's specifications are higher than those of the PS3 and possibly the 360's I don't see why the Wii-U can't at least be on par with them as far as online goes.
I'm hopeful for Nintendo change, even if it's a so called "gimmicky" system I'll still look forward to any of it's exclusives and of course it's main features such as it's built in screen.