My understanding based on what has been posted at Codies' forum is that all current-decade WRC cars are off-limits due to licensing with Kolytonn and the official WRC games.
Unfortunately, no. The physics engines are totally separate, that is the reason why we can't run rally cars on rallycross tracks, and vice-versa.
Online lobbies are fantastic. Championship with up to 6 rallies, 12 stages each, generated right there with Your Stage. Only eight people max. No ghosting. Stage and cumulative times are shown at the end of each stage.