*insert Shakira music here*
And yes, I'm a member (as well as my twin, LeftyGreenMario) of the team, for quite some time before its official announcement (like months) as one of the 3D modelers so I've known about this for a while. The stage of this hack is still in very early beta, so there's not much I can say about our progress right now.
The level editor being used for this is called "Satoru", it's a branch of Reggie NSMBU.
You can ask questions I guess, but don't be surprised if I can't answer any of them (especially WHEN WILL THIS HACK BE RELEASED!!!)
I'll post official updates here when they come around.