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In 1999, the Army set its course for the future with a vision to transform into a fighting force more lethal, agile and rapidly deployable than any ground combat system in the world. The centerpiece of this dominating force is the Future Combat System (FCS), a system of unmanned and manned ground and aerial vehicles that will enable the Army to see first, understand first, act first and finish decisively on the battlefield of the future.

Included in FCS is a system of Manned Ground Vehicles (MGVs), including a non-line-of-sight cannon (NLOS-C). The MGVs will provide a network of eight vehicle types that integrate advanced technologies, and enhanced survivability into, 20-ton platforms. These vehicles will replace the army’s existing fleet of heavy armored vehicles.(Emphasis mine.) They will be the most lethal, best-networked and most responsive ground combat units in the world thanks to a number of common, digital command-and-control elements and advanced weapon technologies. The vehicles are scheduled to begin production by 2008, with full operational capability achieved by 2012.

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Originally posted by Imamikegolf2:
However, it isn't limited to that model. Just like what is going on now, we are planned to field a mixture of light, medium, and heavy units.

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The Future Combat System (FCS) is a revolutionary, "leap ahead" system to form the centerpiece of the Army's ground combat force to be fielded between FY2015 and FY2020. It will be a highly mobile, deployable, lethal and survivable platform, incorporating advanced technology components to enable a significant increase in combat effectiveness. Senior Army leaders explicitly rejected an Abrams-based evolutionary approach to a Future Main Battle Tank. (Emphasis mine.) Instead, the Army will invest in a leap ahead capability that will be the heart of mounted close-combat for the Army After Next. The FCS will blend the capabilities of several battlefield operating systems into a common platform that will reengineer the close fight.

The objective of the Future Combat Systems (FCS) effort is to develop lightweight (no individual element greater than 20 tons) (emphasis mine), overwhelmingly lethal, strategically deployable, self-sustaining and survivable combat and combat support force, systems and supporting technologies for the 2012-2025 timeframe and beyond. Additionally, it is anticipated that the aggregate force will be significantly (at least 50%) lighter than the existing force structure at equivalent force level. The Future Combat Systems will be a single multi-functional system (or system of systems) which optimizes performance of the force leveraging on the advanced technologies (with the capability to incorporate future advances).

The FCS will be light enough to permit two systems for transport on a C17. Full second generation digital systems will provide the nexus for combined arms operations, fully embedded training, and ease of system operation. The FCS will have the sensors and lethality to detect and destroy any target with a near perfect probability of hit/kill at ranges beyond an enemy's capability. It will have a non-line-of-sight capability that will dramatically increase the task force commander's battlespace and combat power. An embedded second generation integrated defensive system will make the FCS nearly immune to enemy weapons. The FCS propulsion system will provide speeds in excess of 100 kph and require significantly less fuel than the Abrams. The FCS-equipped force will require at least 50% less logistical support than the Abrams fleet.

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Originally posted by Asa_Yam:
Senior Army leaders explicitly rejected an Abrams-based evolutionary approach to a Future Main Battle Tank.