Spark Changlog 2.7.0_668 to *stable

I see that even though there is no active maintainer a new stable version of Spark has been released. I currently have the 668 build on all of my clients, and I have noticed that the new build number is 671. Is there any difference between the two, or was the build number bumped for stable release? Any way to get a list of changes, as the only change logs I see compare the major revisions.

Once the 100% CPU issue is resolved, I will be updating Openfire Server to 3.10… does the TLS connection issue affect the 2.7 nightlies, or do you need the 2.7 stable to resolve?