64 player versions of the maps holds more vehicles. Taloraan and Hoth are vehicles only map. Mos Espa and Forest Moon of Endor has walkers and speeders. First release obviously is more of a space combat / infantry combat orientated release. If the team would of gone to full out land vehicles, tanks, walkers, etc etc. it would of taken more time for R1 to be out. 
R2 - I dont know anything about it, and if I did, I couldnt say anything anyways.