Actually, you can start creating leagues and join them now. Would be good idea to get head start and get managers set up and pick a live draft date that accomodates the majority.
I was in KG's league last year, won that, but I wasn't happy. There were a lot of inactive people throughout the whole year, and I was a low seed going in the play-offs. (I even forgot to set one day in the final matchup.)
But, I'll definately play again.