Dementhis said:The next pack is Ultimate pack, adds Ultimate ninja difficulty for campaign, ultimate trials 4 and 5, and new headgear and armor along with completion of ultimate trials 4 and 5 grants you Ryu Hayabusa's head band and his armbands and leg plates, Ryu is also an AI controlled opponent in Clan Battles that will appear on a rare occasion and your team has to work together to bring him down, found this on the official Tecmo site.
The bit about Ryu showing up on rare occasions sounds cool.