I had given up hope for an update for March but they finally pushed it... in April. No changes other than bumping the patch level to March 1, 2018. Update process was quick and easy. No issues since updating.
Samsung Galaxy S7 Software Update | Verizon Wireless
I sure hope, but seriously doubt, you will be able to say the same when the Oreo update is pushed in the next few weeks.
Just received the update and all seems fine.
It does appear that it is just the security patch update