Typically, you get no dealership incentives/rebates if you special order a vehicle.
Like everyone else has been saying, it's essentially the same vehicle in '12 as it was '11. You may get a new color option, or different packages available, but that would be the extent of it.
The new Buick LaCross "e-assist" will be available this fall for around $30k. A few grand more than the Fusion, but lots more standard features as well being a larger vehicle and much classier. Same mpg's highway, a bit less in the city at 25/37 (estimated, no official EPA figures yet).