Firmware update v022.014 for E6 and X7
The update is expected to improve the performance of Symbian Anna. Full changelog is however unavailable.
The firmware can be updated by connecting the phone to PC and by using Ovi Suite or Nokia Software Update. The phone comes with User Data Preservation and hence the data would still be on the phone post update. However, its always good to take the backups of all the data on the phone (required in case the data is wiped out).
It might take some time for the update to be available in your region.
If you have already updated the phone, do let us know the improvements you observed.