That's a nice little touch, I guess
Anyone that's skeptical of purchasing downloadable content around the time that new consoles are set to launch can rest a bit easier. Microsoft has revealed the Season Pass Guarantee program which will essentially assure that consumers have an alternative to re-buying all the DLC they've already purchased.
The program states that if you buy a season pass for a participating Xbox 360 title, you'll automatically be granted access to download the same season pass for Xbox One. This doesn't seem like it'll necessarily hold true for all Xbox 360 games, but Microsoft has stated that EA, Ubisoft, and Activision are all already on-board with the offer. Call of Duty: Ghosts and Battlefield 4 have been confirmed to be participating titles.
The big caveat here is that this guarantee only applies to season passes. If you're the type that prefers to purchase DLC à la carte, you'll find yourself restricted to one system. However, if you're willing to take the plunge on a season pass and buy the game on both consoles, this is a most-welcomed silver lining.