Yes we have tested unmanned turrets on Bradley platforms, do not expect us to place to much inregards to major upgrades, maybe, and this is a big maybe a bigger caliber auto cannon, secondary armor and FCS upgrades but that will be it. We are placing alot of emphasis on a new ground pounder taxi entirely. Whats scary is the fact that you may see this new platform with comparable weight as seen on a tank in full armor module mode, weight limit seems to not be a factor this time around.
Well survivability seems to be the name of the game these days with the US Army. I'm curious given the huge number of capabilities the US wants in a new IFV (and with little regard for weight) why we don't go the route of the Israeli Namer and build a heavy IFV/APC based of the M1 chassis. The Namer has MBT level of protection, good mobility, carries 12 dismounts, and can be upgraded with a 30mm remote turret with Spike LR ATGMs. I don't see why something similar couldn't be produced around the M1 - admittedly the Merkava with it's front engine configuration makes things easier, but I'd imagine that it would still be easier than designing a whole new vehicle.
Adrian