Yes, lots, cookie problems have been pretty much eliminated. Bolded fonts display correctly when using any font besides small. A new "high" quality image quality option has been added to the settings. Opera Link has been added (Synchronize bookmarks with free online Opera account). RSS support has been added. And a context menu for web pages/links is now available (to access it, tap and hold the stylus).

For a full feature list, visit/read this:
http://www.operamini.com/features/