From Blizzard forum user MissCheetah
-Loot. 2.0: New affix system, new stats, new legendary items and affixes, revamped old legs
-With the exception of Torment Only Legs, all legs can drop at all levels. The item level will match your char level.
-Loot 2.0 contains Smart Loot which means you have a higher chance to get items with affixes suited to your character. Not all drops are smart loot though so you can find things for alts.
-Paragon 2.0: Paragon levels converted to account wide paragon. Each character will have paragon points to spend.
-Many many class changes (
read the patch notes )
-Neph Valor removed. No more prepping to do a run.
-MF no longer on items. Legacy MF is reduced to 10% of full stat.
-Lifesteal removed and legacy items will have reduced effects past 60. Replaced by several other healing mechanics
-Normal, Nightmare, Hell, Inferno removed. MP removed.
-Monster Density adjusted. It will be lower than MP 10 levels to resolve game and server issues however you should not encounter big areas without anything in it.
-Cursed chests added: they spawn timed challenge events like killing waves of mobs
-Play through Acts only once instead of four times (unless you want to do it again)
-Monsters now scale to your level so you always get max XP. Item drops will be for your level.
-Leveling speed increased at least for paragon levels
-New difficulty system. Normal, Hard, Expert, Master, Torment 1-6.
-Torment has Torment only lvl 70 Legs (RoS), chance at Imperial gems dropping from lvl 61 and up mobs (RoS), increased Leg find rates. UBERS is now Torment only.
-Torment unlocks at 60 now.
-Updates to some boss fights
-Neph Glory: new globe drop that gives a buff that can stack up to 3 times. Modified by some skills.
-Survival Bonus Added: Pools of Reflection give you a bonus pool of XP worth 25% of the XP you need to get to next level. These stack. If you die you lose the bonus.
-Leveling characters is much more rewarding in addition to being fast. Blues and Rares now awarded for some quests.
-Destructables (barrels, urns, bodies, stumps, etc) can be rewarding. Most are empty but sometimes you get a rain of gold, blue, rare, or Legendary items. Based on RoS Beta playthrough.
-Clans and Communities added (these show lobby style avatars of your characters like D2)
-New Map GUI: You can jump to any unlocked waypoint in the Act by hitting M. No need to physically be at a waypoint anymore.
- Crafting and Other Stuff:
-Crafting costs changed, crafting materials changed w/new one added. New Diamond Gem.
-Crafting mats now stack much higher. May be converted to a currency system at some point to further free up space.Tomes of Secret removed. Converted to DE.
-Updates to graphics, game optimization, etc. Many report less rubberbanding and less asset load lag.
-Potions come in one type, stack to 100, and are auto pick up like gold
What is BOA?:
-New Loot 2.0 Legs can be given to those in party who were there when they dropped for up to 2 hours. They become BOA after that.
-Gold is BOA*
-Marquise gems and up are BOA
-Common Debris and RoS crafting mats are BOA
-Rares modified by the Mystic (RoS) are BOA
-Legacy Legendary items can still be traded/given
-Legacy crafting mats can be traded
-Standard Rares, blues, whites can be traded/given.
*With the AH still in the game at patch time it is unknown how gold will actually be dealt with. Possible that we can't trade between chars but can use on GAH. Will have to see how it works when it comes up.
- RoS Prep Notes: -Legacy Legendary items will not unlock Transmog Skins on the Mystic. This includes Un-ID items. Don't waste gold buying them.
-Do not know if new Leg 2.0 items that drop during the patch will unlock transmog skins or not. Might need full ROS release for that to happen.
-Legacy Legendary items can not be enchanted by the Mystic in RoS. The old affix system is not compatible with the new affix system she uses. This probably applies to all Legacy gear.
-New Loot 2.0 Legendary Items and Rares that drop after the patch CAN be enchanted by the Mystic in RoS.
-If you have good Legs/BiS gear now, it will be useful for leveling up come RoS and will eventually be replaced in the mid 60s to 70 range.
-Marquise gems start dropping in RoS from level 61 and up mobs, even on Normal Difficulty. Think carefully before wasting gold on them.
- What features are ROS Only?: -Act V
-Level 61-70
-Crusader
-Adventure Mode w/ Rifts and Bounties
-Mystic
-4th Stash Tab
NO - we can't play RoS until March 25th, even if we pre-ordered. While that should seem obvious, it was one of the top questions on the PTR and here on the forums.