Samsung has had a habit of releasing monthly security updates without disclosing what's actually in those updates, what issues that it has addressed and fixed, users don't really know what the update fixes and can only figure it out if an apparent issue doesn't exist after the update is installed. There appears to be a slight change in the way Samsung does things, following Google's decision to start publicly disclosing details of monthly security updates Samsung has started doing that as well.
The company has quietly launched the Samsung Mobile Security Blog “to keep users informed of developing security issues,” it's really barebones right now as far as design and content go but Samsung does say that this blog will serve as a main source for security notifications. Samsung mentions that its recent update brings latest security patches from Google aside from its own code fixes, and that it has addressed 14 updates in the release, but it hasn't publicly disclosed all of them just yet.