Hi Michael,
Good question! Here's what is going on.
Before we released FME 2013, we "branched" the code and started a new codestream for FME 2013 SP1. This happened in Nov. So for a while, there were 2 FME 2013s being built -- the release one, and the SP1 "candidate/preview". Because we didn't know how many changes we'd make to the "release" one in Nov, we left a gap of build numbers and started the SP1 build numbers at 13400. So, at some point within Safe's office, there was, for example, a buid 13250 and a build 13403 (numbers are made up). We also made sure that any changes made in 132** were pushed up daily into 134**, so the 134** builds always had whatever was in the 132**, plus whatever else we were doing on SP1.
So the gap from 13264 to 13400 is truly empty, which means we left ourselves plenty of room.
Note -- for SP2, there will be no build gap like this -- we are not branching and did not do concurrent development on SP1 and SP2.
And final note -- though I'm out of office I've heard that there is going to be a hotfix build for SP1 which will repair a regression for those authoring new custom xformers, so there will be one more Sp1 "hotfix" build to watch for.. and then that is it, just SP2 betas...
Thanks Dale for the in depth clarification.
Michael