Some information about American Truck Simulator from Wikipedia:

SCS Software first announced the game on September 6, 2013.[2]

On April 11, 2014, SCS Software announced that there will be more than 100 cities in the game and released screenshots of the game. Truck brands included on American truck simulator so far are Kenworth and Peterbilt, but more will follow. The game will start off in California, Nevada, and Arizona and expand from there. For cities, so far Los Angeles, Las Vegas, and San Francisco have been shown. SCS plans to include the entire North American continent and over 100 cities to explore. A popular mod for Euro Truck Simulator 2 called “Promods” has said they will work on American Truck Simulator throughout its development. According to Excalibur Publishing, the current release date for American Truck Simulator is February 20, 2015[3]

Trucks:
Peterbilt 579,
Kenworth T680,
Volvo VNL 780
others unknown.

American truck simulator mods – soon!