If it were a choice between this upcoming Impala, any of the current cadillacs (except the ls6 version), any other gm sedan, and either the 300C or the charger sedan, I would overwhelmingly choose the DC models. Their designs are much more interesting, they are utilizing their v8's better to match their potential, and they offer more power.
If I had to decide for basic transportation, then it would be a choice between this Impala, and the accord, with a favorable nod to the more attractive accord.
This Impala would have been welcomed ten years ago when the fwd v8's were still held in favor. However, since BMW, Mercedes and Infinity have shown excellent quality and not too bad retail and resale value, in addition to the proven performance of other rwd platforms, I would be very hard pressed to pick a new v8 fwd over the current competition of rwd sedans. It would boil down to price and value at the end......in this category the Impala may have a chance.