To my understandings there will be no more potions, monsters will now drop red orbs that will heal you.
So my questions are:
While playing in multiplayer, will enough orbs be dropped for everyone to regain health?
When fighting bosses, will bosses occasionally drop orbs when you hit them?
And lastly, will there be mana orbs?
Potions are, actually, still in the game. They just have cool downs now.
Yes, there are health orbs that replenish health too. The health orbs actually heal the whole party.
Not sure if bosses will drop them or not. I could see this being a mechanic used to make bosses harder but i'm not sure there is official information on that.
Most of the resource systems are self supporting anymore. They regenerate through different means (either over time, by hitting/fighting, etc). But i'm not sure if there are going to be items that will replenish them either.