If you're on PC just get the reincarnation mod. Bigger stash, bigger cube that you get from the get go, new uniques and runewords, upgrade system for weapons, etc.
Thing is the original was bugged and underdeveloped. They just buffing unused items/skills to be more useful and opens ways to new builds.
To me most important changes are the Mercenaries and set/unique/runeword items will be more useful. Runewords just ruins other items and their value. Also I still love my Act 1 rogue.