I am personally not much of a tablet person, and very much not an RT person. However, if they throw in a nice Pureview camera, a decent photo and video editing suite, and space for lots of storage (or at least large SD cards) then that could be a really compelling product for the mass market.
Personally I am hoping that my WP8 device will replace my needs for a tablet or laptop. I would much prefer to have a single small portable device to get me between my much larger home and work machines.