Are we going to get more Prestige classes, or are they lost to the UA Graveyard?probably not – they didn't receive a very warm reception

— Mike Mearls (@mikemearls) June 16, 2017

You may desire to revisit one other then the runesage, it be that that one didn’t resonate, not all prestige classes are unwanted.At no point since the beginning of the D&D Next playtests have we seen widespread interest in prestige classes.

— Jeremy Crawford (@JeremyECrawford) June 18, 2017

I’m so sad about this. I think it primarily represents an unfounded lack of trust, as in players not trusting y’all despite your commitment.D&D players tend to rate things far more positively than negatively in our surveys, so it's telling when something rates poorly.

— Jeremy Crawford (@JeremyECrawford) June 20, 2017