The FAQ says:
"If a single effect affects multiple players simultaneously, but the players must individually make choices to resolve the effect, the player who played or executed the effect chooses first, with priority then proceeding clockwise around the table."
In the case of A New Hope, would this mean the player who played A New Hope must make all his choices first? Specifically in the case of a game where X-Wing Escort and Devastator were on the table, could the LS player bring the Escort back to their hand first, before the DS player had a chance to bring any of their units back into their hand, thus triggering the Escort's reaction and destroying Devastator? (assuming the DS player had no other vehicles on the table)