Milan will definitely use benchers. Zlatan will play due to the ban he'll get for serie A, but most of the others will be bench players. With so many injuries, tough serie A schedule and only one week before the Arsenal match, Allegri will 100% rest his main players.
Juve will too, most probably, give chance to players who didn't start against Siena. I expect Storari, Bonucci, Esti, Giaccherini, Del Piero, Borri/Quag and maybe Marrone to all start the match.
All in all, I don't expect a spectacle and I give slight advantage to the Juve B team.