Valve has sent Eurogamer a teaser image for something to do with Left 4 Dead.
Check it out below. It was accompanied by a note that said: "In anticipation of an upcoming announcement from Valve."
The Apple-esque stamp in the top right, complete with "I hate different" tagline, suggests we may be seeing something Mac or iPhone-related.
The dots along the bottom are also reminiscent of the iPhone's menu screen navigation markers.
Or perhaps it's confirmation of Steam for Mac.
Or perhaps it's Half-Life 2: Episode III and they're just being extremely cryptic. We still believe!
The next Left 4 Dead-related release on Valve's confirmed schedule is The Passing, a downloadable add-on for Left 4 Dead 2, which is due out sometime this month.