The N97 has just received some love from Nokia in the form of the v 21.0.045 (v 21.2.045 for some) firmware update, labeled at PR 2.1. This update builds on the improvements brought by the previous v20 (PR 2.0) update and will improve call reliability and provide a better touch scrolling experience. The web browser and music player also get improvements; the new firmware also promises improved image and video stability.
Apart from these changes, expect other under the hood optimizations, bug fixes and a new theme. The update will only be available via the Nokia Software Updater at first, due to the large number of improvements. Nokia promises an over-the-air update after a period of testing.
As you may be aware, you can update the N97 without losing data. However, a backup never hurt. I will update this post incase I notice any other changes/improvements.
If you do not see the update via the NSU, it means that the rollout has not reached your product code/region as yet.