Here is the link to the news about this if you haven't heard that already

http://news.yahoo.com/iran-downs-u-drone-war-next-102400114.html
http://www.washingtonpost.com/world/national-security/iran-says-it-downed-us-stealth-drone-pentagon-acknowledges-aircraft-downing/2011/12/04/gIQAyxa8TO_story.html

The Gen there gives some specifications as following :

Total wing span 26 m
Total length 4.5 m
Total Height 1.84 m
Same Stealth Technology used in B2 and F35
SAR Radar (Synthetic Aperture Radar)
Iranian Military Aerospace Unit landed the drone with only 1% damage to the body. Everything inside is intact