I saw an ELR prototype at the preview event in the World Congress Center in Atlanta on the 10th. It was dark grey metallic with the saddle and black interior. It was inside, and fully open to explore. There were factory reps there to answer questions, too. There was also a full bar and delicious appetizers circulating frequently, making it a very classy event.
The car is quite attractive, and looks nothing like a Volt. It does have slightly unusual proportions, but also has a lot of presence. The interior is the real star. I wasn't overwhelmed when I saw the pictures on the website, but in person it was quite impressive and luxurious. The seats appear to be similar to the sport seats in my ATS, except that the control for the side bolsters raises and lowers the lumbar support instead. That, and the leather was of much finer and luxurious quality. The door panels were swathed in leather with sueded inserts, as well as wood AND carbon fiber, and blue light bars. The dash had all of the same treatments, including the sueded inserts, and a much more intricate sew pattern than any other current Cadillac. The headliner is black sueded microfiber, too. CUE is there, with an extra "energy" app. This car had the current version of CUE, but they promised another update soon will make it much faster and more responsive, as well as other functionality.
The overall impression of the interior was extremely luxurious and sporty. I did think that perhaps the carbon fiber was unnecessary and maybe a bit overdone; the tan interior has piano black in the same places, and may be better for it. Clearly, few expenses were spared with this interior, and goes a long way in justifying the price. It is also clearly styled with the current Cadillac design language, both inside and out. The back seat had some issues, though. First, it was extremely difficult to enter and exit, as the seat did not motor forward, and the shoulder strap was in the way. Hopefully, they will fix this oversight . Second, while there was actually some rear legroom, and the seat itself was pretty comfortable, there was a severe lack of rear headroom. My head had to be tilted to the side, and still was pressed into the glass. A 5'8" man's head was just touching the glass, and might find bumps to be a problem with hitting the window. His 5'7" wife fit quite comfortably. In this respect, the back seat reminds me of the one in the Infinity G37 coupe. Neither car is a true four-seater, because lack of headroom is harder to deal with than a lack of legroom. If they could drop the rear seat bottom by an inch, it would help a lot; I'm not sure there is space available to do this, though. Front headroom is adequate, though there was no sunroof.
The trunk is a small 10.2 cubic feet, like the ATS, but with a smaller opening; it is not a hatchback, like the Volt. It is nicely finished, but I forgot to ask if the seat folds down. It should be adequate for it's intended purpose. The underhood looked very neat and organized, but nothing otherwise special.
Of special note: the steering wheel was similar to the ATS/XTS except that it had "paddles" (really elongated buttons) attached to the rear of the spokes. These paddles control regenerative braking. Apparently, this is a world first technology.
Overall, in the showroom, it should do quite well. Hopefully, it will drive as impressively, but that remains to be seen.