Mojang announces a February 2nd release date for Cobalt, following news last year that the platformer would come in February. This is coming to multiple platforms, and the post has some specifics about the Windows version coming to Steam on Groundhog Day:

NOW A NOTE ABOUT THE ABOUT THE STEAM RELEASE
As mentioned earlier, Cobalt is coming to Steam for Windows. And it’s going to have Steam Workshop support. That means enthusiastic players will get the chance to create their own levels and share them with others around the world. Pretty cool. Its also worth noting that anyone who’s already bought into the Cobalt alpha will get a Steam code for free via their Mojang account. We’ll talk more about that closer to release.

So yes! Get hyped! In around 18 days you’ll be able to download Cobalt and experience this wonder for yourself, you lucky sons of a guns.