Below are the 188.8.131.52 release notes, along with some inline bullet points on the improvements, (thanks to Russ providing the information below to me):
[*] Improvements * Added the Razorback "Snort as a Collector" (SaaC) dynamic preprocessor. This is for experimental use only! Enable it by compiling with --enable-rzb-saac. * Fixed false positives in HTTP traffic, which were caused by large HTTP chunks split across two packets.
* Made several updates to the Snort manual and READMEs. * Fixed a false positive on Stream5 rule 129:15, caused by a RST following a FIN.
* Fixed a bug in HTTP_STAT_MSG