Hardware drives innovation in gaming. It's great that they have scalable engine so their future games can be built for more powerful hardware, but this is going to have little to no effect on BF3.
Been saying it for quite some time now, the extended life cycle of the current gen consoles has resulted in stagnation. Its not just "grafix" that benefits, its every aspect. Pathfinding, AI, physics, environment size & complexity, complexity of scripted events, amount of active NPCs with complex AI. Literally every aspect besides GUI benefits.