Samsung followed Google's lead last year to promise regular security patches for its most popular phones. It's been following through with the updates, and today it's time for the February patches. If you've got a flagship Samsung device from the last few years, you can expect an OTA notification soon.
The OTA includes all the CVE items listed in Google's February bulletin, as well as several Samsung-specific vulnerabilities. There are a few memory corruption and buffer overflow attacks in there, but some of the vulnerabilities are still non-public and are not being detailed at this time.
Samsung did not explain which phones count as "flagship models" in this case, but in the past that has meant any high-end device from 2014 or 2015. This includes the Galaxy S5, Note 4, Galaxy S6 family, Tab S, Tab S2, and Note 5.