They have never shown any evidence of that. I find it unlikely since the first gameplay showcase looked like a DOS mod and to me was a disaster.
So they implemented 5e raw -> just to step back and make a D&D/DOS hybrid -> just to step back and make it more like D&D but missing many core features?
Doesn't make any sense to me.
Prototypes aren't being showcased at all aside from internal showcasing with "Yeah, guys, this is what we are going to develop". And they do exist more as a part of a game development documentation than actual part of a game. For better understanding same
Just read about games prototyping. Google knows.
