A melee-oriented class is possible given that Diablo 4 Barbarian is the only one revealed so far, however for one major reason, it's not likely to Diablo IV Gold be a Crusader, Paladin, or anything of that nature. According to their lore as committed heroes inspired from the heavens and the true decimation of Heaven itself, it's unlikely this specific class comes back. Now, some sort of variant is not hopeless and a Blackguard at Diablo 4 would be incredibly interesting however it played, if it had been an anti-hero looking for revenge or as something truly bad (not seen in Diablo really).
It could seem like a perplexing request, but lore-wise, it might be interesting to play with an Angel fighting hordes of demons. The decimation of Heaven can even give itself this manner, but it's not likely to take place at launching, in DLC, or ever really for 2 chief reasons.
To begin with, the idea of the franchise is mortals beating allies, and also an Angel is clearly not a mortal. The latter may provide in at some stage, as seen between the first two games, and it's a big storyline point. Secondly, Diablo has never been a match about needing a committed Healer class and to do this would add a strange gameplay component to Diablo 4 which is very unnecessary.
Of the classes here, the Demon Hunter is the most likely to be included but nevertheless falls squarely in the improbable zone for two big reasons. First, it's worth mentioning that Diablo Necromancer Necromancer DLC could have been the Druid or even Amazon according to their prevalence at Blizzard. The inclusion of this Druid here may well beckon afterward, making one of the two unannounced classes likely to be buy Diablo Gold the Amazon. It seems exactly the identical function as the Demon Hunter effectively, and might well take precedence over it. That's not to say the Demon Hunter couldn't come afterwards as DLC, only that at launching the signs point in different ways.