You gotta be really careful these days - with Photoshop easily accessible these days, there are a lot of people who are designing cars and slapping pictures up on the internet. Someone finds it, posts it on a few car boards and *BAM* - a "concept car" is born.
It's obviously someone who got creative with a Challenger concept or studio image and put their name on it. Just the presence of the signature in the first photo tells me that this is an "artists rendering" - not an actual concept car.
All that being said, it looks good, but still looks too similar to the 300/Charger/Magnum/Challenger.
Jeff