My understanding is that the US military has two new vehicle procurement projects under way. The first is the Future Tactical Truck System (FTTS), with two classes of vehicle: the utility vehicle, with payload of 3 tons, and the maneuver sustainment vehicle, payload up to 13 tons. The FTTS vehicles will replace the military's current collection of supply vehicles.
The second is the Joint Light Tactical Vehicles (JLTV) competition. Three categories of vehicle here: 3000, 4000 and 5000 lbs payload. These vehicles are more closely targeted at replacing the HumVee. The JLTV role is recon, command, and ambulance duty on the front line.
While the FTTS and JLTV projects are ongoing, a third procurement effort was begun for the Mine Resistant Ambush Protected (MRAP) patrol vehicle for use in cities in Iraq. The vehicles rushed into service as MRAP really don't meet the needs of either FTTS or JLTV, and there is concern that the MRAP trucks are not sufficiently maneuverable off road to be useful in a different type of conflict.
With all the talk of bailing out failed investment banks to the tune of $700 billion, it's likely that all the military vehicle programs will be scaled back and slowed down so they are not so expensive.