Ubisoft’s announced that Ghost Recon: Future Solider will be getting a beta in January 2012.
The announcement, as with most things these days, was made via Twitter. Currently you will only be able to take part in the beta if you have an Xbox 360, although whether this will change nearer the time is anyone’s guess.
Ghost Recon: Future Soldier is expected to release in early 2012.
You can pre-order your copy here (PS3), here (Xbox 360) and here (PC).