On a less silly note, it's interesting to see how they've changed the design. The new Roomba (third generation) has the battery buried inside rather than clipped in, much smaller gaps around the bumper, a rubber strip above the brush deck, and the cliff sensors are now on the main body rather than the bumper. It loks like they've made an effort to stop up all the gaps where dust would get in on the previous model, which can only be a good thing given the number of times I've had to open up the last one to clean the bumper touch sensors. They also appear to have tweaked the programming - at first glance it's a lot more competent at docking with the charging base than the old Roomba was.
Also, contrary to what iRobot tech support said, at least the infra-red remote from my previous Roomba is compatible with the new one.