Not really a MBT; but eh. We don't get much US Army armor lately....
http://www.janes.com/article/55223/a...gunned-stryker
The army is working to up-gun 81 Strykers with 30 mm cannons on remote weapon systems and others with Javelin anti-tank missiles, a long-considered upgrade that was pushed through an operational need statement from the 2nd Cavalry Regiment based at Vilseck in Germany. Service leaders approved the plan in April and now testing and integration work remains.
The cost per system appears particularly high (about USD5 million per vehicle), and according to Heidi Shyu, the army's acquisition executive, this is partly schedule driven because it is through an urgent need statement that is seeking the upgrade as soon as possible. It is also for only 81 systems, so the limited quantity drives up per-unit costs. The price includes a design and integration element as well, she added.
These lethality upgrades are not for the heavier armoured Stryker Double-V Hull (DVH) vehicles, and rather are for the original flat-bottom configuration, although a Stryker engineering change proposal (ECP) effort may eventually include a 30 mm weapon for the DVH, Shyu said. "If we want more Strykers to have this capability beyond the 81 [requested in Europe], we will start a programme of record to do that," she said, noting that the cost could be lower with a procurement of thousands of units.
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TBH; given past experience with US program cancelations; and the full state of the US OOB; I'd hold off until this actually does enter service.