If u have total hw control on wiiu mode and latte have hw upscaling. I think is possible upscale wii games like we do lot of load options with devo/nintendont with gc gamez on wiimode.
Other : i have talk with very trusted coder. And him say to me: in theory is possible enable save state on wii/vwii instead normal game nand save. That can open the possibility to plat 2players games. Via internet