God no... all of that weight in the nose would screw up the balance of one of the best balanced FWD vehicles available. If you want over 300hp, the 2.0 Ecotec turbo can already offer that, GM certified.
But then the Regal has the same engine as a $50k Cadillac XTS. What GM has created by making Cadillac a V6 brand, is that Buick becomes a 4-cylinder brand. Wouldn't surprise me if even the Lacrosse loses the V6 in favor of a turbo four on the next redesign.
I have a feeling GM is going to put eAssist on everything and just make people buy it. Cruze will get it, Equinox, Enclave, CTS, et