Improved graphics, same ole hack fest...
Character development---don't balance things out, pick your poison and go for it.
Team AI---mirror and rampage modes can be a mixed blessing. Use mirror for unique or boss types. Rampage to quickly clear screen.
Loot---same fanfare. A few more unique and set items, but quirky attributes.
Overall---DS2 is still a good game, especially if you can find it for $30 or less. With new graphics, some new skills, and new effect damage in some areas, it continues to add to the DS series overall without being evolutionary. Depending upon whom takes over the series will determine where it will move too, but for quick and fun hackfest with a hint of RPG elements, like character development, this is a fun introduction for all.