Well the N97 has got a new firmware update and this puts the new version to 12.2.024 and before applying this update make sure you have ran a backup of all your phone data.
To update you have to download from Nokia software updater or OTA.

You can find several unofficial change logs all around the net but there is no official one from Nokia themself, here is an example of some stuff has been noted to be fixed or improved.

Following cases have been corrected and/or improved:
- Fix for browser cache consuming more than specified in C drive
- Battery indictor showing wrong status (2-3bars) when charging completes
- Firmware over the air (FOTA) setting correction
- User interaction to device while FOTA may cause need for user to power on/off
- Fix for calendar entry lost
- Fix for mail that may get duplicated
- Fix to resolve GPRS access point selection even if WLAN access point is available
- Fix to not to ask user to do new profile while there is already one available
- Fix to display messaging application correctly when theme effect is set to ON
- Fix for Ovi store client may not properly installed if user has a client already installed earlier version
* Applications changes – Ovi store application is now updated.