I agree with Nathie. I think it will be similar to buildmart, an MC Championship game that was played a lot by streamers and YouTubers during and a bit after the pandemic.
If it's not that, it could possibly be inspired by Dress to Impress. Maybe a take on a build battle game where you have to build within a theme, but you have limited resources and you have to purchase the blocks you want to use for your build.
I don't think we'll have to wait too long to actually find out. It's exciting!