At http://susanpolgar.blogspot.com/2008/11/4-major-changes-at-this-olympiad.html four major changes are described. The biggest change has to be the scoring system with individual point's not counting and teams only earning 2 points for a win 1 for a tie and 0 for a loss. In my opinion this is not a good idea with a swiss pairing system. A format of pool play like the rugby and soccer world cup's is best suited to this scoring system.
Another change of a shortened number of rounds could produce a mixed result, at least for all the medal contenders.
It will be interesting to see if these changes bring positive or negative results.