Ok, this is my crazy idea. But has anyone thought or considered taking the gun system from the Stryker Mobile Gun and fitting it to the hull of the M1 Abrams? That should (at least theoretically) shave about 30 tons from the weight of the vehicle and since horsepower would remain the same, it should literally turn into a hot rod. If a further modification is done and its engine is switched out to an MTU turbo diesel then fuel savings might be found while we're at it. Just tossing it out there.
Thanks to Military Today.com my vision of the future in a slightly different form is illustrated with the Chieftan Falcon Turret. BAE has teamed with KADBB so its technology that we could acquire rather easily.