no surprise onside kickoff anymore, but there is still onside kickoff for trailing teams starting 4th quarter.
https://operations.nfl.com/the-rules/rules-changes/new-dynamic-kickoff-rule-explainer/#:~:text=Onside kick%3A,at the A20 yard line
Onside kick:
4th quarter begins, the team trailing has the opportunity to declare an onside kick to the officials
Current onside kickoff rules would apply. If onside kick goes beyond the setup zone untouched, kicking team penalized for UNS; return team would start the drive at the A20 yard line