I would presume (going off the little snippits of info I've gleaned) that almost ANY device will be able to run ICS in some capacity or another since it is designed to be all encompassing. (Think Ubuntu for comparison) Admittedly some older devices will struggle due to the specs but this is the same for every old device.
I could be completely WAY-OFF the mark but I believe el-goog is heading down the Canonical Road and pretty soon we will have OS's that just play well together, be it on mobile, laptop, PC, TV yadda yadda yadda......and then we'll see a small moon appear on the horizon
No wait, "That's not a moon.....It's a SPACE STATION!" cue dramatic music and suddenly everyone and their dog will be screaming "IT'S A TRAAAAAP!" "TURN THIS SHIP AROUND!" but by then we'll all be caught in the tractor beam and headed for a Schwartz-off with Dark Helmet......