Erm... Not that I want to be a party pooper but, didn't we know that already?
I mean, Retro has never developed a handheld game (they helpled in MK7 but that's it), and while Tropical Freeze used their Wii engine, it was a given that they would work on a new engine to get most of Wii U's capabilities.
Please excuse my bad English.
Currently gaming on a PC with an i5-4670k@stock (for now), 16Gb RAM 1600 MHz and a GTX 1070
Steam / Live / NNID : jonxiquet Add me if you want, but I'm a single player gamer.