The latest issue of Famitsu, by way of IGN, has some nice new info on Resident Evil 5: Alternative Edition in regards to the bonus mission for Jill and Chris. The new mission is set three years before the events of RE 5 as they’re searching for Ozwell E. Spencer. You saw a few flashbacks to this scenario in RE 5, specifically when Jill was trying to remember who she was.
The play experience will be the same as RE 5, except replace Sheva with Jill in this section. It’s set to be about two hours long and should provide more horror than what RE 5 offered too. You will be able to play this flashback story with a friend in co-op and you’ll actually be able to play co-op between the original version of the game too.
Finally, producer Jun Takeuchi told Famitsu that this bonus mission will be coming for the Xbox 360 as well, but it’s not clear whether this will be DLC or a disc. We should be hearing more details soon.