CV-22 Testing out of PDX!

There has been a CV-22 operating out of empty hanger here at PDX over the last few days, it is accompanied by a dark grey C-12, it seems they are here to test the aircraft in inclement weather or something??? The aircraft is AWESOME to watch operate and when it flew in initially all cars coming out of the commercial terminal slowed WAY down, I guess not many people have seen something like this before! The ANG and GA ramp here have gotten some awesome military action in the last couple of months including aggressor hornets, VX-9 SHs, T-45s, C-40bs, and now a CV-22! Although this visitor is much more shy then the rest… Do any of you in the US or abroad get allot of action at your public airports as well? (pics welcome!)