From STO Website:
We’re all very happy to be able to let you know that Star Trek Online will be in Open Beta from January 12 – January 26, 2010. Keys will be given out on a first come, first served basis, and can be acquired right here on startrekonline.com. We know you’ve all been eagerly anticipating your chance to experience the Star Trek Universe in a way that only Star Trek Online will allow, and we can’t wait for you all to beam aboard this great adventure in January!

Link to STO Official Site