Found this pic and article over on Allpar...https://www.allpar.com/news/2018/12/the-next-generation-ram-heavy-duty-without-camo-43083

Looks good....lots of chrome, but tasteful and not aggressively ugly like the new Silverado HD.

It is far from all-new.  Still has the old cab.  Heck, even the bedside panels look the same with new taillights and rear bumper.  Only thing I see new is the front clip.

Cab is completely immaterial. No one brags (or cares) about the cab, IMO. And if it IS different, it's just a tweak on the prior one- cab design isn't going to change more than 10%. Frankly, I see the whole "NEW MODEL YEAR" thing as being on the downside of the Bell Curve since about 1965. I think the '19 Ram is still using the same windshield from 1994 (and why not?) ;)