The robot, "Survey Runner", is made by Topy Industries Co. in Tokyo, and looks like a smaller version of Quince. The robot is going into the Torus Room of Reactor 2 on April 18.
From TEPCO's handout for the press, English, on April 17, 2012:
Topy Industries Co. is a company located in Shinagawa-ku, Tokyo. It has been developing the robots for disaster response in collaboration with Professor Shigeo Hirose of Tokyo Institute of Technology Department of Mechanical and Aerospace Engineering since 2003. For more on the free loan of the robot to TEPCO, see their English press release.