i think I've worked out something.
the other day ea sports tweeted the cover but with the 2 wide players blacked out, asking people to guess who they were.
on the left was an outline that looked exactly like van persie (with a unique hairline etc). and on the other side was the same outline as AOC (it was flipped the other way though.
as arsenal are on the demos of the game i assume they have a similar deal to us with ea, and united don't (hence why they don't have a player there anymore).
as van persie has left to utd, he can no longer be on the front, so hart is there as a replacement.
but then i do think it would have been strange to have 2 arsenal players on the front