The are numerous post in the Beta area on the enhancements http://forums.dlink.com/index.php?board=251.0
Most people want it for AFT drive support. Many, myself included, then roll back to v1.09 for stability after the drives have been formatted. I can't say first hand that v1.10 is unstable or not though as I didn't run it long enough to find out, since at the time it way only a Beta.
It is still a good box for basic/specific purposes. If it does go on sale so that vendors can get rid of stock, I'd consider buying one or two more as for what I need it to do, it works just fine. I've fixed a couple of issues that bothered me (Date/time, torrent for example) by installing FFP, since this is the only way to enhance the product now.
Unlikely I will need or want the other functions (itunes, etc) but if I did I'd surely want bigger hardware in the newer models. Personally, I want my NAS to be JUST that, I couldn't care less if it did anything else, although I must say I'm used to the having it handle my torrents now.