I would LOVE if the Blood Knight from Diablo Immortal was a class to play as in this. But, Druid and Necromancer are still my go-to. (Assassin was my main in D2). Now Spiritborn? That would be SPOILING ME if that's in as well.
As for the D6 dice pool system, I wouldn't low-key mind if it ended up like a Soulbound-like. Especially since everybody starts off seasoned from session 0. YMMV on that.
My go-to classes were always the Paladin/Crusader and the Necromancer. The lack of a Paladin-type class in D4 has been something of a persistent sticking point for a lot of fans.
I'm not kickstarter fan, but as a Diablo fan, if hardcovers ever hit regular sale, i will buy it, if for no other reason, than as cool art and lore books to enjoy.