Howdy,
OK, it’s done!
9.2.1.2-RELEASE is now up on https://www.freenas.org/download/ – please come and get it!
This point release for 9.2.1 fixes even more issues found in 9.2.1.1 in CIFS, NFS locking, the new .system dataset, ACLs, migration during upgrades, serial consoles, and a few smaller things. All bugs fixed in 9.2.1.2-RELEASE can be found here.
From a high level, these are the most significant changes:

• Samba (SMB/CIFS support) upgraded to version 4.1.5
• Linux Jails now work with UFS
• NFS lockd now starts properly at boot time
• Serial console misconfiguration is now harder to do.
• Logging to .system dataset is now optional. If you have an old syslog dataset (which is how this was formerly done), you are strongly encouraged to transition to the new .system/syslog dataset by enabling that option in System->Settings->Advanced and simply deleting your old syslog dataset.

Otherwise, the 9.2.1.1 ReleaseNotes still apply, so I won’t repeat them all here!
We’d like to thank the community for its patience in dealing with the many issues we introduced in the name of progress (or just hadn’t been found until people really started beating on CIFS) in 9.2.1.
We’ve worked very hard to nail those issues in this series of point releases and are confident that we’ve finally gotten this branch polished to a pretty high gloss (which is what you want in a NAS!). We certainly could not have done so without all of your testing and feedback over the last month, so again, thanks!
– The FreeNAS Engineering Team