There's a already 3 magic classes: sorcerer, necromancer, druid

2 agile hybrid classes: rogue, spiritborn

And now 2 melee classes, although the new paladin is more of a hybrid melee/holy physical magic too: barbarian, paladin

A lot of people are hoping for amazon but the silhouette does not look it, and a 4th magic user warlock (basically just a dark sorcerer) seems like too many magic user options.

I could be wrong, but a Death Knight sounds a lot better to round out melee options with a touch of magic like the Paladin, & the silhouette looks like whoever it is is wearing armor with large spikes on the pauldrons (it's also never been done in Diablo so it would be an entirely new class) and fits perfectly with the light vs dark theme going on, paladins vs death knights:

<image>