The info about the track seems to imply to me that the track is not close to release yet. I wouldn't be surprised if the New tyre physics/Scirocco patch would be released without Rockingham.
Arbitrary numbers of alpha-blended layers work just fine in LFS now. The engine just doesn't sort transparent triangles/objects back to front before rendering. What you're seeing there is most likely a normal texture with binary transparency which works fine without depth sorting. LFS does that already for the fences around the tracks and most drivers can improve the look of these textures by using multi-sampling, thus achieving the illusion of proper alpha blending.
None of this is connected in any way to the D3D version though. You can do this correctly in any version of D3D. Just takes CPU time to do it and it can be clunky to do in a generic way.
EDIT: Actually I'm talking rubbish. The fences have a multi-bit alpha channel and are presumably properly depth sorted (which is easy since they're always at the bottom unless you've really screwed up a turn . It's likely the Rockingham shots are the same. The trees and other details have a single bit alpha channel though.
ok totaly foreget what was in my last post, i middleclicked the link to open it into a new tap and that doesnt work anyhow (also with all the pictures)