Class Changes: http://www.diablofans.com/news/2021-diablo-iii-reaper-of-souls-datamined-class-changes-including-even-more-crusader-abilities/
Item Affixes: http://www.diablofans.com/news/2019-spoilers-ahead-diablo-iii-expansion-reaper-of-souls-datamining-post-bosses-game-modes-clans-ladders-and-more/
At first I thought I would go in depth, line-by-line of the posted info. But considering that this is just internal testing and a lot, if not all of the information shown here will change as time goes on. I figured I would just keep this post relatively short and simple.
The Diablo team at Blizzard seems to be going in the right direction, although I personally feel that this is not a complete fix of the real issue with the game. But of course, to fix what I feel the real issue of Diablo 3 may require a complete rebuild of the game engine, and I guess they might not want to go down that road.