Also, GenCon will be offering special room package rates online later this year. I'm not sure what exactly they are or how much they'll be, but I'm guessing they'll have information up on starwarscelebration.com as soon as it's available. Those will most likely sell out very fast, so don't miss out. Just for the record though, our hotel rates we booked ourselves at Celebration III were about the same price as the ones GenCon offered online.
The point I'm trying to make though is that you should at least be thinking about this now instead of three months before the con when you'll be lucky if you can find a hotel room within 20 miles of the convention center.
If anyone has any questions about the Celebration, feel free to post them here or PM me. I went to Celebration II and III (but somehow missed the first one which was held in my hometown).