Aaron Greenberg whom is the Head of Marketing for Xbox, recently responded to a tweet asking when the Halo 5 digital pre-order would go live and he responded saying that it would go live E3 week. See the tweet below:
We can only assume that this is just the beginning and more games will follow. As of right now, digital pre-orders are done when the game is available to pre-load, the only exception is Call of Duty: Black Ops 3 which Microsoft has said is up to the publisher. What other games would you like to see become available to pre-order in months advance? Sound off in the comments below.