Halo 2: Anniversary doesn't officially exist, but that isn't stopping Microsoft Studios boss Phil Spencer from talking about it.Asked by IGN what the most important feature of the game (which is widely expected for this year but unconfirmed) would be, Spencer said (with a smile, apparently), "In this fictitious world where that game existed it's an easy answer: it has to be just the multiplayer experience that we all found in that first 
Halo 2 game. If you think about what happened in the franchise and what were the hallmark moments - when did duel wielding come in, when did another playable character that wasn't Master Chief come in?
"All the things that you and I know about the evolution of the franchise, if you're going to say one thing about 
Halo 2, you're going to talk about real multiplayer. I think you just have to nail that in just such a fundamentally core way.
"Frankly [we'd have to do it] probably better than we did with 
Halo 1 Anniversary. I thought the multiplayer in 
Halo 1 Anniversary was good, but 
Halo 1 never had multiplayer in the truest sense, so it always was going to be something different."
"If there were something called 
Halo 2 Anniversary," Spencer said, "I think the multiplayer would have to be fantastic."
Spencer himself teased an Anniversary release for 
Halo 2 when he 
tweeted, "Never get tired of questions on what's coming. Just can't always answer as we need news at events. 
Halo 2 is a good game..."
More solid confirmation 
came from Master Chief voice actor Steve Downes, however.
Plus, it's been 10 years since the release of 
Halo 2, and anniversary editions of its big games is something Microsoft does now. So, yes, fingers crossed for a multiplayer component worthy of 
Halo 2 and Xbox One...
Source: 
IGN