I am waiting as well. No word yet if mine have shipped. I actually ordered two so I could reletter one for "Kenefick". That was one I wanted but didn't want to buy the whole train to get that one car. I believe both business cars have essentially identical exteriors.
Pete
Thanks Pete. I had a brainwave and looked at Lionel's Facebook page (which I don't usually) and, lo and behold, there are numerous photos of the various new passenger shells, including that for the Kenefick business car. This answers my question about the exteriors but not the interiors, which are distinctive in this kind of car - see final image from the UP Heritage Fleet roster.
None of Lionel's other 21" cars have an interior assembly anything like the above so I am guessing that they must have made something new. K-Line had 18" business cars with full interiors but I haven't researched exactly what they comprised and, in any event, I doubt that they were one piece moldings like Lionel's current production.