I wonder what valve will do when they release it.
Valve will probably do nothing?
What makes you think that?
Valve is known to pick up quality projects if they like them enough. Team Fortress, Counter-Strike, Day of Defeat, Garry's Mod, Portal, list goes on.
If Valve DOESN'T pick this up to sell it, I can see them at least giving it Steamworks integration for Achievements, stats, etc.
Edit: My bad. I read your post wrong, as with H_B's. Just take a look at Swiftu's D: