What are IoT specific features in 5G?
There is a full study item IIoT (Industrial IoT) in NR, even mMTC (massive MTC).
Depends which release.
Rel15 not many. Rel16 some. Rel17 more I think.
Check 3GPP TR21.915 .916 .917 documents for feature descriptions.
From what I understand most of URLLC and IoT features have been pushed to Rel17.