We just got the new Citizen (Eco-Be) MicroRobots this morning - two weeks before we have to deploy them at RoboCup! A quick comparison shows them to be squatter and a little bulkier than the first generation Citizens used at last year's Mixed Reality competition, but the design is just incredible. Note the removeable controller board, separating the control system from the robot body, and lots of foresight for future expansion of sensors. The control is much finer too, compared to the first generation, in that each wheel can be controlled at 30 different speeds in each direction.
Rodrigo Guerra put up a nice video demo of these units as well.