Unfortunately the Tour 2 isn't a part of the list of phones for comparison. I've never really looked into the Tour before and don't know too much about it, so I'll just do a comparison of the originals.
I don't really know the main differences either, just the basic technical specs.
It isn't out yet but I've read that it's almost identical to the 9700 but it will be CDMA. It's actual dimensions will be closer to the Tour (slightly larger than the 9700). CDMA phones are usually a little larger than GSM phones because of technology differences. So it's basically a 9700 in a tour form factor with a trackpad.