I know this is quite premature as we're just about to release 3.3, however development on 3.4 has already started in SVN and we've already implemented more than 20 requests from our features tracker. This is even bigger number than release 3.3 will have!
Well the fact is that most of these things are cosmetic or tiny improvements, on the other side some of them were requested for very long time (the oldest one currently dates to 2003).
The new features bring things such as direct blob download (thing we definitely should have earlier), links to documentation for SQL commands in highlighted SQL (what was quite easy, but nobody requested such thing and I added the feature after seeing that Adminer does this), possibility to directly bookmark most pages or exporting user privileges. See ChangeLog for more detailed list of features.
You can try all new features on our demo server.
