Wild Mass Guessing/Other/Star Tours

The Death Star in Star Tours is a prototype for the actual one
If Star Tours likely takes place inbetween episodes 3 and 4, the Death Star would not be gone, and destroyed like that. Unless if it is a smaller, and weaker prototype.
 * Word of God is that it takes place post-RotJ and the Death Star is a new one built by Imperial sympathizers who won't admit that they lost.
 * According to this timeline, it takes place 11 years after the Battle of Yavin.
 * What are R2 and 3PO doing then?

REX will come back for Star Tours 2
He will be depromoted to co-pilot.
 * This has been confirmed, though Rex will be a droid in training in the queue of the attraction.