The current patch release is 2.0.0p16 as of today.
You might want to keep an eye on Announcements - Checkmk Community for this kind of information.
edit:
@fayepal pointed out two more options:
- Go to Topics tagged checkmk-release, on the upper right click the bell icon and choose ‘Watching’. That will send an e-mail for every new topic.
- If you are a mail type, go to Checkmk-announce Info Page.