This is one concept (one of many) that I'm looking forward to this show season!
I really admire the Chrysler 300 & 300C, it had great road presence and curbside appeal, but the only thing I never liked is the lack of length (even though it's wheelbase is 120"), it's width & height are fine. Even it's platform-mate, the Dodge Charger is some 3-3.5" longer. Others like the 2006 Impala and Ford 500/Mercury Montego have a little more length than the 300, as does the Buick Lucerne and especially the Caddy DTS. Even it's predecessor, the Concorde/LHS had more length.
I hope the Imperial would be for production, it would be a nice step up from the 300C and fit just below Mercedes.
Funny thing: if the Imperial materializes, and if a movie remake of the Green Hornet is produced, some movie director would probably like to get a hold of it and cast it as his ride!