With New Datamined Patch News, we know that Two New Character Slots Added and Critical Hit Chance, Critical Hit Damage, Attack Speed, Movement Speed have caps from items now. As Paragon 2.0 would offer Paragon Points instead of MF/GF, these caps are predictable.
Two New Slots Added: Now we have 10 hero limit for every Diablo 3 Account. When you decide to buy the Expansion Reaper of Souls, you would have to additional slots for the Male Crusader and the Female Crusader.
Trifecta Caps: This is a big change. When you set your heroes, you should keep this in mind. For example, you can have +12% movement speed from boots, +12% movement from the Lacuni, +12% movement speed from the Inna's Pants. Technically, you should have +36% speed, but the reality is that you would only have 25T% movement speed as there is a cap. As to MF/GF, would you still try the MF set of items in farming when the smart drops comes? It is a question.