This 2.0- software is supposed to make the N97 more user friendly and should fix many major bugs. The changelog includes improved battery life, new versions of Ovi Maps, and Ovi Store and Nokia E-mail. The music player is improved too.
The update seems not to be downloadable for each user. Nokia has already promised a similar update for the 5800 XpressMusic, but the new software for that device is not available yet.