for us (wedding in May), the resort didn't sell out until pretty recently, and that's largely how it went last year. but I absolutely agree with JessicaAnne's suggestion about being prepared with held reservations well in advance. I was stunned when she wrote that the resort was sold out (it pushed our last two couples into booking ASAP). I think being filled that early is unusual, but it does happen.
TA Wendy is on here, so you can message her directly. she often comments in this forum.
congrats on booking your date! we've been planning for 18+ months, and I can honestly say that in the beginning, it was FOREVER away, but as we've gotten closer, the time has gone exponentially faster. : )