This is interesting -- a 12-speed transmission that includes a "smart" version of an old feature; free wheel coasting:
Green Car Congress: New Detroit DT12 transmission contributes to enhanced fuel efficiency and performance for heavy-duty trucks
The picture also shows a oil pump for the transmission:
Chrysler has 8-speed transmission (with 9-speeds coming?), so plain ol' 5-speeds are so ... 20th century.