Hot off the press as of a few minutes ago! The new Roombas have been announced (iRobot Roomba 560). New features include: room to room cleaning, built in RF, light touch sensing, voice instructions. Impressive update for the most ubiquitous robot in homes (over 2mm) – Link.
If you’re curious about their hackability (the previous Roombas have an open interface) — the new Roombas have flash, an RF link, and a larger processor… So it’s just a matter of time :)