Of course if you want to compete in WOC 2014 you'll have to be careful where you go, as it'll be used for one of the Sprint events

http://anfr.tripod.com/woc2014/venezia-venice.html
In terms of accommodation the cheapest is off the main island, either on the Lido (20 mins to event centre by waterbus) or Mestre, but are "normal cities". On the island the nearer you go to the train station the cheaper it gets. But if you look around the Internet you should be able to find decent deals as it's off season.
Details should be up 10th of September but as others have said, there won't be any surprises in them. Assembly is always the same as is 90% of the rest of the information. They're pretty chilled about the whole thing but the organisation is spot on, they've never had any issues in 30 years, apart from the odd spot of acqua alta..