Spied: 2015 Cadillac CTS Coupe?

I spotting this prototype out testing in the Pittsburgh area. Some may claim it's an ELR when they see the supposed "charging port door" on the front fender, but look closely and you can see it's been drawn on the camo in a sloppy fashion and isn't a real door. Also the ELR has been officially released already so there's no need to drive cars around with camo on them. I believe it to be the ATS or CTS Coupe. What do you think it is? Still pictures can be found here: http://razzi.me/albums/24984-spied-cadillac-cts-coupe
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