Both the N97 and the N97 Mini got firmware updates recently. The N97 was bumped from v20.0.019 to v21.0.045 (or 21.2.045 for some product codes).
It was available through the Nokia Software updater tool and should be available OTA now.
The N97 Mini too got a firmware update, from v10.0.020 to v11.0.045. This seems to be a minor update with a few bug fixes, and more free ram on startup.
Do let us know if you noticed any other changes.