Not sure how involved he will be from the start though. It's probably more with the view of letting him settle in during the second half of the season and having him fully involved next season.
I actually think that's one of the advantages of getting someone in January as you can ease them in while they get used to things off the field and hopefully they can kick on from start of next season.
We have a very settled and pretty good central midfield so no pressure to start him right away unless we get loads of injuries in that area.
I also remember signing Young in January 2007 and he showed flashes but wasn't that amazing which got people nervous we'd overpaid at the time but he was right on it from start of the next season and quickly made the England squad.