The voice of GlaDOS, Ellen McLain, is back in the studio for more recording work - at least according to her husband's Twitter account. "Ellen is going in Tuesday for a new game and more Portal work," John Lowrie wrote and everyone went nuts and started to hammer on the re-tweet button (or, well, 46 people did at the time of writing).
We don't know exactly what she's recording, of course. We expect it to be for some Portal 2 DLC, but it might also be for ring tones or GPS-software. We simply don't know. But somewhere, GlaDOS is still alive (sorry, had to get a "Still Alive"-reference in here somehow).