The website hasn’t been updated in a while, but progress is always being made.
The hack is now half-finished. With any luck the hack can be officially released by July/August, but I wouldn’t get any hopes up as I’m always behind deadline with my NSMB hacks.
There’s been a fourth trailer floating around on YouTube for a while, but I’ll be updating the trailers page with it soon. The hack is currently undergoing major internal changes as the mid-production bugfix has begun.