The blimp shows up numerous times in the trailer, which I guess means there's something more to it.
Many thanks to Cpt Slaugh7er (xboxachievements.com) for the signature!
R.I.P. to the most wonderful person to have ever lived; my Nanna. 03/11/1932 - 06/10/2013. You will be forever remembered, and forever missed. I love you so much.