They clearanced out all of the T2's and T2 Plus tents, doing the same with the T3's. A friend of mine picked up a T2 for ~$150 after tax and shipping... great deal on the tent.
The new model should have a slightly larger footprint for the same weight. I read this somewhere not too long ago, possibly on REI's site.
edit: based on Adrian's link it looks like the solo is the one that got a bigger footprint.