Soundwave on 01 February 2015
Tecmo-Koei works pretty fast, I think they could pump out a Hyrule Warriors 2 in a fairly straight forward manner.
I think some ports of Wii U games that enough people didn't play the first time around could be feasible too ... Donkey Kong Country: Tropical Freeze deserved to be enjoyed by more people. Add an "easy mode" and a few extra levels with faster loading times and I'd double dip to play it again on the go. Pikmin 3 could fall into this category too.
