The season pass includes add-on packs that will have six additional costumes and "will challenge Lara, Carter, Horus and Isis to conquer new tombs and collect a treasure trove of unique rings, amulets and weapons." Pre-ordering on the PlayStation network nets Hitman themed costumes and Agent 47's Silverballer pistols and Agent ring, which provides more weapon damage and powerful bombs.
The Temple of Osiris is the follow-up to the criminally overlooked Lara Croft and the Guardian of Light. It's very, very good. Check out our review. Osiris will welcome you to the underworld in December.