4) Some way to trace when files were added to MMA and filter for that, or have a "recently added" tab of some sort.

Additional fields and AutoPlaylists has already been promised for MMA 2.0

1) Support for additional text fields from MMW like "involved people" "comment" and "original date"

2) Some kind of link from albums to Discogs and/or AllMusic, either their websites or apps. The discogs tagger is so useful in MMW, but most of the data are lost in MMA. It would also be nice to have a link to AllMusic for their album review.

3) I agree with a previous request for a list of the last 20 or 30 recently played tracks, within the app.