Grezzo is looking for devs who would like to make a "Legend" with them. This is the second time they've put out a request like this, which is why they're calling this campaign, "Would you like to make a Legend with us 2". The first time they did this, Majora's Mask 3D was revealed.
This time, Grezzo is looking for devs with knowledge of HD game creation, as well as skills in Unity and Unreal Engine. That all lines up nicely with the Switch, and we know Grezzo has worked on Zelda titles in the past. It's also important to point out that the blurb makes no mention of Nintendo in any way. We have to figure out if Grezzo is reference to Zelda when they say "Legend", or if it's another game with Legend in the name.