Hmm I'm really hoping Cayman XT is more than 10-20% in current titles and with that I hope it scales with clock speed better ( GF100 anyone ) I'm more concerned with game performance today, not in 6-12 months. If it does significantly better in the games I play now, I'd want one, if not meh. Its kind of like the 8800GTX. Although its among the first DX10 cards, it also did exceptionally well with the current DX9 titles.

A large boost to DX11 alone isn't enough to personally sway me to buy one.