they're likely going to convert WiiU games into eShop, single screen remasters
its not like the 2nd screen was mandatory for most games so that shouldn't be a problem other than having to buy the game again.

we don't know what the battery life is or standby time. i said PROBABLY abysmal.
The Nvidia Shield clocked around 6hrs so i'm assuming this would get you 3. The handheld part for me, is merely a bonus so i can play games anywhere in the house like my 3DS.

we also don't know how it connects to the dock. It would be smart if there was a usb hookup, but i'm sure they're gonna have some proprietary connector, forcing you to lug the dock around.