Ok firstly Im guessing the console version will be for the PS3 and not the PS2.
As to you question about DX versions - pc games makers have to cater for as mant possible hardware combinations.
DX9 is still going storng, with a low uptake for DX10 / DX10.1 / DX11 - so you can be assured that when it comes out for the PC it will work on your hardware.
some games already have an option to run in DX9 / DX10 / DX10.1 / DX11 - as time goes on and newer video cards come out and get lower in price eventually DX9 support will fade. This is likely to be some years off yet though