Valve will make an announcement for a non-video game project tonight.
That's according to GTTV, which teases that the announcement will be accompanied by an exclusive trailer airing on the latest episode of GTTV tonight.
Host Geoff Keighley says the show will reveal "the exclusive trailer for a new non-video game project in the works at Valve."
What could it be? If it's anything to do with the Steam Community update Valve has been shouting about this week, we'll be disappointed, that's for sure.
Speculation of a movie announcement turned out to be baseless, but we still wouldn't rule that out.
The firm has also previously confirmed plans to sell non-game software via Steam - perhaps it could be something to do with that.