It's not going to happen.
Inside Line got the word right from a Buick spokesperson's mouth: "Absolutely not... There is no Regal Wagon in our future plans."
Still, even if the report is correct, that doesn't mean there won't be some expansion to the Regal portfolio. In addition to the recently launched eAssist and GS models, there's been a lot of talk about a two-door coupe version, and until we get a definite 'no' statement from the product folks within GM, we have no reason to doubt that it's in the cards. There's also the five-door liftback model that's already on sale overseas under different badges. Shame about that wagon, though.