Ubisoft has just dropped the message that on April 23, H.A.W.X. will be receiving the "European Assault DLC." This package includes six new aircraft models - ranging from the "FB-22" to the "Saab-37 Viggen." This DLC comes with a pricetag of 400 MSP, and there is no word on new achievements yet.
Along with the news of this upcoming DLC, Ubisoft released image sets of "Russian Falcons" and "U.S. Eagles." Both of these image sets showed 5 pictures each of yet-to-be-announced models, so it's safe to say that H.A.W.X. fans should hang on to their games, as more DLC looks to be coming in the near future.
See the external link for these images.