It was referenced earlier this week that the 12-15-2010 trainer still works, so instead of waiting for a trainer that is optimized for the 12-09-2011 patch, you can use it instead.
A note of warning with this trainer is that the ammo cheats are a bit unstable when used with more than 1 gun, or even with more than 1 gun in your inventory. so best results pick your gun of choice and stick with it or sell your current gun first then buy your next gun
Nice one thanks!
Would be good to get an official 12/09/11 trainer though.