I think the games are delayed into the quarter to keep the game releasing in the same fiscal year if this makes sense to you.
Publishers need to generate info for their stock portfolio. If a game that release in say mid-March, it won't have the same statistics that they can present to the company board and thus to their stock holders.
I'm too tired to phrase myself well :p But basically they need time to sell the game so they can show their revenue for the fiscal year







