Will SH5 be DX10 game .

[Arclight]

You mean if that 260M supports DX11? No, it's a DX10 chip. The first DX11 cards should make their appearance later this year, with Nvidia's GTX 300 series and ATI's 5000 series.

99% sure SH5 won't have DX11 features, considering it isn't mainstream yet (far from it, even DX10 isn't universally accepted yet). I wouldn't worry about it yet, at least untill those first cards see the light of day it's not worth wondering about.