Lately there have been several news / rumor articles on various general car sites that Cadillac may come out with a CTS Coupe V Series model (Likely), or perhaps a CTS Sport Wagon V Series model (unlikely). Certainly it is easy to see that if the new LSA 6.2L Supercharged V8 fits in the CTS-V sedan, the same wonder-powertrain can fit into the CTS Sport Wagon or CTS Coupe.
But the 2009 Cadillac CTS-V is NOT just a CTS with a big engine option. It has specific suspension components, performance brakes, different hubs and wheels, and a variety of other performance related bits. Could Cadillac do all in and make a CTS Sport Wagon -V? Sure. Does it make sense to do all that engineering work so they can see a few hundred of them? Nope.
Now, the CTS Coupe V Series may be a different beast, as it may be the PREFERRED platform for the V-series driver.
So I predict that we may see a V-series Coupe, but not a V-series Sport Wagon. I would be the first one to be happy for Sport Wagon fans if Cadillac does manage to produce a V-series version of every Cadillac model including the Sport Wagon. But I will be surprised if they do.