I believe this is the marine variant of the new F-35 Joint Strike Fighter. It has the fan on the back, and the vents. It can take off vertically, and it is slated to replace the AV-8B Harrier.
Airplanes - Military - Parked - Fighters
Links: virtualglobetrotting.com, www.strategypage.com
By: voldude123
http://alumnus.caltech.edu/~marcsulf/nato/f15.gif
vs.
http://upload.wikimedia.org/wikipedia/fr/thumb/7/7c/X-35c_(F35).jpg/250px-X-35c_(F35).jpg
The trailing edge of the wing looks more like the F-15. Also the cowling around the air intakes extends more forward like the F-15s.
It is hard to tell though.
http://local.live.com/default.aspx?v=2&cp=32.779114~-97.45003&style=o&lvl=2&scene=4146281
http://virtualglobetrotting.com/map/b-36-peacemaker-wing/