They'll have a 410 hp turbo 6 that runs on regular gas and a 510 hp turbo 6 that uses premium. The charger concept you saw will morph into a 4 door and the new challenger has yet to be seen, probably next spring.
Those numbers are no different than my 4 yr old Coyote and fuel economy will likely be similar.....so I don't see the point? Will they finally make a drop top? Doubtful. Laugh at my Mustang all you want but 465 hp, 25+ highway mpg and the top goes down. Pretty fun little summer toy!