Army of Two: The 40th Day was a sequel to the third person shooter featuring mercenaries. It was more of the same thing from the first game and not much difference can be found in the sequel.
This might change with the next sequel in the franchise. In the unannounced title, EA is supposedly going to double its efforts making it Army of Four.
EA’s Montreal Studio is in charge of development of this latest sequel and work on it have been difficult. EA might pull some personnel over from DICE now that Battlefield 3 is out.