Ruin Explorer
Legend
Classes: I do think Warden's will effectly come back and either a druid or barbarian, and warlord is still up in the air, IMO. What we won't see are Binders, Factotum, Incarnum, Duskblade, Swordmage (sad face), or really any other whole classes. We will see things like those classes in various subclasses, but most of them won't be super satisfying.
I'd forgotten Swordmages were even a thing but they were actually legit awesome.
Speaking of legit awesome which we won't see in 5E - Vampire as a class or race!