We already know that the Hellcat motor is going to be shoved into the Grand Cherokee; Jeep CEO Mike Manley confirmed it already. Now, someone has spotted a prototype thundering through the streets of Detroit.

In the video shot by YouTube user Sinister Life, you can clearly hear the whine of a supercharger at the 2:18 mark.

He notes the presence of what appear to be the Brembo brakes from the Dodge Hellcats in the front of this Grand Cherokee, and the front bumper is wearing camouflage.

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While we can't see the front bumper, we already pretty much know what the Hellcat-powered Jeep Grand Cherokee is going to look like.

Perhaps most interesting is the fact that this particular prototype apparently has a roll cage inside it. Don't get your hopes up too much, as that's probably not going to be a factory option, unfortunately. 

We know the Hellcat-powered Grand Cherokee will have a supercharged 6.2-liter Hemi V-8, but whether it has the full 707 horsepower like the Dodges is yet to be seen. The question probably depends on whether FCA was able to get the all-wheel-drive system to hold together with that much power during launches. Another possibility is that it could have 707 horsepower but it's neutered in first and or second gear to preserve the all-wheel drive components.

The name is also a big question market. While one must assume it will be called the Jeep Grand Cherokee Hellcat, it very well could go by Grand Cherokee Trackhawk, as that nameplate was trademarked by FCA.

Boys and girls, it's clearly time to start counting your pennies, because this thing is happening, and it'll be here soon.