The Xbox 360 private beta for Blackops 2 has leaked, at the moment it's not playable without Xbox Live. If you have some keyvaults to burn you can use the new hack that allows Jtagged / RGH hacked Xbox 360's online for around 24 hours before getting banned. If not you will need to wait for an off-line split screen / bots hack like with the Blackops beta that leaked back in 2010.
Even though i keep telling myself i dont want to buy Blackops 2 i still want to give this ago to see what the maps / multiplayer is like. However i have Blackmesa to keep me busy for now.