After waiting forever and a day for a non-Paxton Supercharger alternative for my old GEN III Coupe when I had it, all I can say is "don't hold your breath". I just can't see it happening from the factory! It never took for the GEN III (beyond a Paxton) and absolutely nothing for a GEN IV and it will be absolutlely nothing for a GEN V.
The guys that say it is so easy to pump the power up have literally zero idea what is involved in the big picture with strict emissions. When I could not get a 100% stock GEN III Viper to pass the new 01/01/2012 emmissions standards in Colorado with just a full Bellanger (headers, hi-flo cats and cat back) set up, you realize how close to the edge these new Viper engines are running with emissions and durability involved. I can tell you the new GEN V at 640HP had a ton of trouble to meet the emissions regs as evident with the two trips to Colorado for high altitude testing and what the SRT engineers would share in discussions over dinner.
Be very happy you have a 640 hp motor in the new car. Taking it much above there with the current pushrod block, NA set-up, etc. is going to be very, very, very difficult if it is to meet the current and upcoming regs. It is NOT just high mpg ratings the new future cars have to comply with. The out of control EPA literally wants the exhaust to come out cleaner than what gets sucked into the intake in their fantasy world.
If it ever became available in a perfect world, it would be an off-road only Mopar Supercharger accessory which would void the warranty of the Viper completely and immediately upon turning the key. Can't see this happening in a 1,500 to 2,000 yearly run of cars, unless the supercharegr is completely backward compatible to GEN IV and GEN III where the number of cars is greater. Only requires a different intake for the GEN III cars. Again, that is a perfect world and just don't see it happening.
Now a supercharger on the current SRT-8 platforms is very realistic due to numbers and would be nice to see it. The new JEEP SRT8 is almost there, just lacking that 600 HP supercharged motor. Same with the rest of the SRT-8 line. Due to the numbers of vehicles involved though, it would be a tame 5 psi TVS set-up that works with full warranty and durability. Hopefully it would be factory but even a dealer installed mopar product would be acceptable.
You guys have to remember, how finicky and durable was a 640hp Hemi car back in the 60s and 70s? This is a totally different time we live in. It is the joke EPA's greatest achievement as they save the world from itself. All sense of common sense is all but gone.
I just would not wait around for a supercharger and doubt we will see one in the Viepr. The SRT-8? There is a good chance there as they have to do something to compete. NA will not cut it with the V6s, and V8s.