Considering they just came out last year, I’d venture to say at least another 2-3 years minimum. Agree with you though, bummer they kept the old cab style. A good buddy of mine got a 2500 (crew, not mega), and while nice, my 1500 cab is noticeably larger. Also, they don’t offer pano roofs, and have less headroom in the rear.
Pretty disappointed, considering Super Duties now share cabs with the F150s.