There is a new version of the M-ATV, from Oshkosh Defense, deploying to Afghanistan.

From Army.mil:

Defense Secretary Robert M. Gates has pressed hard for the past two years to bring medical care in Afghanistan in line with what’s available for U.S. troops in Iraq. This includes medevac capabilities that ensure wounded troops get advanced medical care within one hour of their injury, which is a factor that medical experts agree makes a major difference in survival rates.

…developed in cooperation with the mine-resistant, ambush-protected, all-terrain-vehicle program office, is an M-ATV-like ambulance specifically designed to traverse Afghanistan’s demanding terrain. The first 250 are scheduled to go into production this summer and are expected to be fielded this fall, Lee reported.

Unlike the mine-resistant, ambush-protected, or MRAP, ambulances in Afghanistan that were designed to operate in Iraq, the M-ATV-like versions are being built from the ground up for conditions in Afghanistan. They have improved suspension systems and offer more mobility and speed than the MRAP models.

Additional coverage at Wired’s Danger Room