imo there won't be texture mods just like there aren't any in bc2... cod is easy to mod cuz cod 1,2,4,5 actualy were made for moding and mw2 just didn't change the file types.. it was still .iwd and iwi files... but bc2 was harder... there are programs made to open bc2 files but still u can edit the file and put it back together..
to mod bf3 u first need to open those .sb files and .toc and than learn how to compile them again in the right way.. its not gonna happen in beta but in full game it might after some time
and btw I found level files MP_007 and MP_subway
is 007 caspian border??