Badge 109 - Regarding your query about C-Liner 'B' units, I don't see anything stated about them in the latest catalog. That said, this seems to be the practice of Lionel (and other manufacturers) in the recent past, so it's 'assumed' B units will eventually be forthcoming. However, you know the old saying about when you 'assume'.
Although I didn't see Ryan and Dave's video unveiling of the catalog, maybe they mentioned something about future 'B' units. If so, perhaps someone on the Forum who saw their catalog reveal will clarify this for you (and me).