It's been a little more than a year since we first reviewed the R.A.T. gaming mouse from Mad Catz, and called it the best mouse we’ve ever played with. Since then, there’s been a couple of incremental upgrades to the line (the cordless R.A.T. 9, the white "Albino" R.A.T. the 6400 DPI Contagion Edition), but nothing that fundamentally altered the design. They’re about to do just that, though, and we got to take a sneak peak at the result.