Could be, could be.
The word that I heard 6 months ago from a source inside that I trust was that the Imperial would likely be an SUV. There has been noise about this for some time prior to the latest that you see below.
I would bet on maybe something as a "lineup" to go against Cadillac, which has both cars and "trucks", so could be both a stretch 300 and maybe something else on a hemi truck chassis? Perhaps Mercedes has figured out that there is a direction to take in the marketplace that will not negatively affect its other "luxury" brands? Big RWD 'mericun' cars might be a different niche from their high-end german lines? How long since DC bought Chrysler? How long since the 300C went sales crazy? How long is a design cycle? Seems like just enough time has passed since someone may have woken up and smelled the coffee and changed Titanic's design direction to favor the old ways of having a top-to-bottom segmented lineup.
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Oh, and Neal - when you speculate that there may be a new Riviera and conclude that it will be a 2D as they have always been, keep in mind that the 2D 300 tradition ceased with the re-intro of the 300 line lately, although fewer remembered 300's so I guess that they had greater leeway on that than they might with a better known item like the more recently produced Riviera.
-Kenyon