Before release I said 64m for WiiU. Not long after I said 10m less; 54m. Apparently I never posted in this thread, but now I'd say it should still be able to get to N64 numbers. Though maybe that too is a bit of idle hope.
I've always said, since the very beginning, the Vita won't get far past 20m. I see no reason to change that prediction.
So all in all I'd post the same as ExplodingBlock did a couple hours ago:
WiiU: 35m
Vita: 20m