We'll be having a three round supplemental draft right after Christmas. Its similar to our regular draft except that the draft order will be in reverse of the league standings. So the #1 guy (probably me) will go last, and the last guy will draft first. Rosters are required to be 15, so in order to pick up a new guy you'll have to get rid of someone already on your team.
Thats the only form of free agency we have, which is why trades are so important.