Increased speed is good. FF9 is known for pretty drug-out combat, especially if you steal (and you should, if you want Zidane to be good)
No encounter option is always good. Learn from Bravely Default.
HD cut scenes are always good too, but it's not really a seller for me.
The Steam page claims "early 2016" as a release date. It's early enough! It also says "Seven game boosters" which might be a typo. Would pre-order if I could.
Kinda curious if they'll fix bugs, like the famous Thunder Slash bug, or bring back the game-breaking bug that allowed you to get Gold Choco before getting captured by Kuja.