I believe that the first release will include only regular CJ model. It would take more time to sync all diffrent models and many people are already whining that "OMGZ WHERE THA MTASA IS????+++ WHY ITS NOT OUTT?????++ PLZ RELEASEIT!!!!!!!!!!!!!!!!!!!!!11 LOL!". From my opinion, it wouldn't be important in the first release.
And MTA:SA will be ready when it's ready.