I have not seen any rumors about Gruden running a spread offense.
It was in the CBS Sports story linked in another thread, and the story also addressed the possibility of Morris coming with him (reprinted below). It is still based on "sources," but....
"College football could provide more lifestyle balance than the pro game, as well as a new challenge for Gruden, who last coached in college in 1991 as the wide receivers coach at Pitt. Gruden has been spending significant time studying Chip Kelly's Oregon spread offense, sources said, which is perfectly suited for college but remains a question mark in terms of its translation to the NFL. Several sources said Gruden would strongly consider Redskins secondary coach Raheem Morris as his defensive coordinator. Morris coached in Tampa under Gruden and succeeded him as head coach before being fired after 2011. Morris, who had a stint as the defensive coordinator at Kansas State, is viewed as a strong recruiter. However, sources said Morris is more likely to focus on possible NFL opportunities at this point in his career.
http://www.cbssports.com/nfl/blog/jason-la-canfora/21041240/the-nfl-today-arkansas-tennessee-want-jon-gruden