A surprise patch for Adobe Flash. After not releasing a patch for Flash on Patch Tuesday 2 weeks ago, Adobe has now come out with APSB15-23 that addresses 23 vulnerabilities in Adobe Flash. There are no known exploits for the vulnerabilities so most likely this out-of-band release is due to extended testing in the QA process. As always Google Chrome, Microsoft IE 10/11/ and Edge users get their patch through the operating system update process.
Not sure why it has not been packaged with next months, but potentially disclosure deadlines were in play.