It' s hard to find any info on the plans for the Taurus. Thanks for posting these links, sketchy as they are. I am very interested in the new Chevy SS but I love my SHO. So the question is do I wait or move on the SS. It's probably a good bet that the new SS will keep value based on exclusivity but 17 mpg average is hard to take when I'm used to 21+ with the SHO and I'm still doing 18-20000 miles per year. I will keep looking for any info on the changes and then make a decision in 4-6 months. By then we should know more on any potential changes to the SHO.
I suspect you are correct that the SS will hold its value better. Back in the 90s, used SHOs dropped in value as quickly as another any other car, but the Impala SS seemed to barely depreciate at all. A friend of mine bought a '94 SS new and sold it a couple of years later for only $1,000 or so less than he paid for it new. The SS badge has a long, well established history, the SHO, not so much.
That being said, I just bought a 2014 PP SHO, which replaced my low mileage (15K) 2011 PP SHO. I buy a lot of new cars and have never purchased the same car twice, which says a lot about how I feel about the current generation SHO. This current gen SHO just hits a sweet spot for me that the new SS doesn't and the re-designed SHO probably won't either. I love the massively torquey engine, the AWD, the tall profile/high ride height, and giant trunk.
Based on what I've read so far, the new SS is unquestionably a better car for what most people think they need/want. However, no AWD is a show stopper for me and it has nothing to do with foul weather capability. I've had quite a few high performance RWD cars and know my limitations. Even on dry pavement, a high HP RWD car either needs to be in full nanny-control mode or the driver really needs to know what they're doing. I've owned a Z06 and an 6.0 GTO, and both were prone to the rear tires going up in smoke on dry, clean pavement. As a point of reference, I was at the local dragstrip a couple of years ago on hot, humid summer night. There were a bunch a G8 GTs, a G8 GXP (6-speed manual), and a few hemi Chargers in attendance. My tune-only '11 SHO ran very consistent times that were a couple of 10ths quicker (but several mph slower) than the GXP. I was .7-.8 quicker than the G8 GTs, and .9-1.1 quicker than the hemi Chargers (I was several miles per hour faster as well). Their times were all over he map due to traction, and this was a relatively well controlled track environment. On the street, it would have gone even worse for them.
There's also no question that the RWD SS handles better than the higher center-of-gravity, FWD-based SHO, but really, anyone who is exceeding a PP SHO's handling envelope on public roads isn't going to have a driver's license very long. It's like comparing a car with a 200mph top speed vs one with a 150mph top speed. Who cares? It's simply a stat with no real world applicability.
I guess in the end, it comes down to this: the SS is a better performance car out of the box, but it's questionable whether said performance is usable in the real world. The SS will almost certainly hold its value better, but I can almost guarantee that there will be no discounts off MSRP (in fact, they will probably be marked up significantly), while fully loaded SHOs can be found at huge discounts off of MSRP. In fact, I suspect most SSs will go out the door for 10-15K more than a loaded PP SHO. I'd also be willing to bet that a new SS is going to cost in the ball park of a low mileage used CTS-V - which is much, much faster and will suffer negligible depreciation.