Sierra Interactive used to be one of the great developers (and publishers) in the world of PC gaming. They have been dead for a while now, but this teaser website put up by Activision suggests a return (at GamesCom) is imminent.
What kind of return that would be is anyone's guess. We could get a full-blown revival, with new games in classic franchises, since Activision owns most of Sierra's old properties.
Or we could get an Atari-like deal, where just the label lives on and we get a bunch of re-releases (not the worst news).
Or... well, you don't need me to bring up the less desirable possibilities. The ones involving app stores and *shudders*.