That would be pretty funny if it just, all of a sudden, appeared on the Steam store for purchase without any form of announcement or hint ahead of time.
Well, the circle is SteamOS, and the next icon shows a circle in a box, so I assume the next announcement is the SteamBox. I'm clueless what the third announcement is, though... SteamOS + SteamOS?
It looks to be a Chrome window and the URL appears to be "danielj.valvesoftware.com/p4monitor/" and the page title is "P4 Monitor". P4 in the URL and page title probably means Perforce which is version control software. Danielj is probably for Daniel Jennings, the developer behind change...