For that one it looks like this year's didn't go up for the first week or so according to
http://www.cruisefish.net - after that some went up ~$50pp and then it was a slow creep over the month as cats sold out.
TBH the only time I worry is if it's a brand new sailing that has never been done before/is very rare (Bermuda might go up quicker than others) or if I want a specific cabin.