A DTS - STS REPLACEMENT is on the way. This is why the V-model is being discontinued... SHORTLY thereafter, the DTS and STS will be replaced entirely by a single model, and a cheaper entry level caddy will slot below the CTS. It is rumored that the G8 frame will provide rear drive vehicles for Caddy, Buick, and possibly even the new Impala SS. Buick and Caddy will definately get the suspension. The Impala is still under "review".....
Yes, there is a replacement on the way, but not the one you think. And it's much further away than you think.
The platfrom on which the G8 is built, known as "Zeta" at GM, will have no new products built on it after the Camaro. The G8 is dead when Pontiac folds up in a year or so. There is no further work being done on this platform for the US.
The replacement for the STS and DTS is going to be a FWD/ AWD sedan based on the corporate "Epsilon II" platform. Check this out:
It will be 2012-2013 before we see this new car. The current DTS may well soldier on for 2 more years. I wonder just where they plan to build them, though. The plant currently used for Lucerne/ DTS production is slated to be converted to build small cars on the "Delta II" platform including the Chevy VOLT in the next year or so.
The STS will, as GM has announced, die after the 2010 model year, if not before. In any case, I believe production of it will likely end by the first of the year.
There will be no RWD Impala, either. The replacement of the current car will also be a FWD "Epsilon II" development.
The entry level Cadillac is planned on a smaller, lighter RWD platform under development called "Alpha". It is this platform that will be enlarged to eventually replace the current CTS's "Sigma" platform (If GM survives, and that's a big "IF"). It's design is complete. The only thing holding it up is..................you guessed it........................money.
Or, as many have stated, the entry level Cadillac will be a production version of the CONVERJ concept, sharing "Delta II" underpinnings with the VOLT.
The Zeta platform (G8/ Camaro) is too heavy and cannot be adapted to hybrid powertrains. The Sigma platform too (CTS) is simply too heavy and too expensive to be profitable for the corporation. The CTS will see a mid-cycle refresh for 2011. It's replacement for 2014 will (again, if GM survives) be a stretched version of the "Alpha" platform.