mightyjlr,
The new 300 series cars are going to replace the 300M. The 300C is the top of the line model, with the Hemi engine, stability control, and all the toys. The other models are the base 300 which is powered be the 2.7L V6 carried over from the current Concorde, and the 300 Touring, which has the same engine as the current 300M the 3.5L V6. As far as 300N...haven't heard anything from my end as of yet. But who knows, the Chrysler Group has quite a few new vehicles in the next year, the SRT10 truck, new Grand Cherokees, Dakotas, SRT 6, 300's, Dodge Magnum, SRT 8... It's hard to keep track of everything.

pk