It updated on its own, the 4th 0.9.8 version I've seen so far. I'm in the Collections [Your Music] beta group, so that may explain it.
The high CPU usage seems to be gone when the Activity Feed doesn't load. It isn't loading at the moment. This might be the main improvement of the new version.
Still no filtering on Artist pages.
Still no Album support in Playlists.
Still can't see Starred tracks within playlists, just the "+" sign, no indication what tracks are Starred, only a check mark indicating a track is included in "Your Music." I hope they are not going to phase out the Starred list completely.
No major differences I can see offhand. Back to 0.8.3.
My Spotify just updated to 0.9.8 and so far my main issue is with the profile: playlists arranged by number of followers and not however I want them to be, playlist thumbnails on the profile only show the first song and not a mosaic, and everything is too big in general. (Why non-Facebook users can't have a profile picture still?)