Standing behind the PackBot in a demo room at iRobot's headquarters is a newer design from the company, the Warrior, which is now going into beta testing and being tried out in combat exercises. The Warrior is significantly heavier: 250-300 pounds, compared with 50-60 for the PackBot.
iRobot CEO Colin Angle describes the Warrior with unabashed enthusiasm: "That robot is going to change the world, and change the perception of what practical robots are all about. We're pretty passionate about that."
Correction, April 17 8:05 a.m. This caption initially misstated Warrior's speed.
There's also a smaller, lighter variation on the PackBot called the SUGV (small unmanned ground vehicle), which was developed in conjunction with the U.S. Army's emerging Future Combat Systems program--and which may well get an expanded role with the Army even as many pieces of FCS look vulnerable to cost-cutting in the Pentagon's proposed defense budget.