Nice progress on several fronts!
P.s. A no-midi, no-video audio recording and mixing dinosaur such as myself would love to see a greater portion of the changelog devoted to implementing features and squashing bugs in the UI and audio engine realm. For a few ideas, Reaplugs could use some more bug-squashing love; high DPI support (vector graphics, you name it); reliability improvements to the audio engine, especially in relation to PDC, anticipative FX processing etc; UI custmizability "wizard" such as discussed here:
http://forum.cockos.com/showpost.php...4&postcount=29
P.p.s. I purchased a license for v4 and Reaper has improved a lot since then, so overall I'm a happy customer, just a little jealous to see all the midi folks rejoicing all the time! Yet the midi improvements make it easier to recommend Reaper to people.