I seem to remember someone posting in the old "Wii U Games 2013" thread that Retro was looking for an FX artist. The requirements and the jod description were fitting more into
a rather tech driven game than anything else... so I don't see it being another DK.
Sounds more like the Metroid game we all have been waiting for.
Do we even want (current) Retro to do the next Metroid? I'd vote for someone else.