The Season Pass, a 1360 Microsoft Points or $16.99 purchase, will include the "Fight of the Night" and "International" Fighter Packs, the "Ultimate Upsets" and "Mixed Bag" Ultimate Fights Packs, playable Alistair Overeem, and the "all unlockables" key to get all the content normally unlocked through gameplay. And if you happen to pre-order from ShopTHQ, this season pass is free. Not a bad deal for a lot of UFC stuff (and THQ could use the money right now).
All this stuff will also be available separately. In addition, there's some DLC that isn't part of the Pass, including the $3 "Create-a-Fighter Boost," which gives you extra points for your custom fighter, and two sets of "Ultimate" fights that are already free at launch. Check after the break for details on each pack.