I have been to that tournament many times. The hotel issue happens all the time. They are not out of rooms. They typically run out for the World Open around early May. This is a notorious problem that seems to happen with CCA events (not limited to the World Open).
Send an email to Bill Goichberg (go to www.chesstour.com, the email is listed on the home page (spelled out, I think to avoid spammers, you'll know what I mean).
I won't be at the World Open this year. Going to the Chicago Open (May) and US Open (July/August).
Also, a word of note. Another issue that is notorious for happening with CCA events is that hotels will block only King rooms, not 2 Double rooms, even though Bill will specifically tell them they will need majority 2 Double, as chess players often tend to go in pairs and split room costs (as will be the case with me in Chicago). It's not that CCA doesn't know what they are doing. It's the hotels being stupid! Trust me!

I was considering playing in the 2013 World Open in the U2200 section, since I've only played before in smaller regional events. Are any other members planning to go? I ran into a problem in that when I entered hotel dates in to check the price they said they were already sold out! so the tournament flyer "hotel rate" of around $100 a night becomes $200-$300 a night at another comparable hotel (i.e. not fleabag) and I'd have to travel to the site each day.. that's just not feasible. I think they're going to have a big problem if the hotel is indeed already sold out.