If that's what the next Wario Land game looks like... then I will buy it day one, no questions asked. I mean, THAT is what a Wario Land 4 sequel should look like. Beautiful, with greatly detailed graphics and absolutely amazing level atmospheres.
I'm just a tad gutted that it's only a mock up. I mean, the maker of that picture should take it to Nintendo and actually ask to make a Wario Land game in that style. Cause come on, no one else seems to be interested...
Looks like an upgraded version of Wario Land 4. Not sure what the necklace on Wario is for but it may be related to WL4. That art looks like the inside of the pyramid in Wario Land 4 for sure.
I believe I read his necklace turns him into a rat. Which is surprisingly fitting for Wario. He'd probably enjoy it as much as being rich. xD Then again he hates it when he changes his form as said in the WL4 manual.