Update 5-52013 There is now a Falling Skies Overlord Prop to download as well. Pretty creepy looking prop. So go find the advert again and download the new Alien Prop.
There is a new Falling Skies Advert on the dashboard. All you have to do is watch four of the trailers and it will open up this XBOX Avatar T-Shirt for you. It looks pretty plain on the front but check out the back! Let us know if you see it in your country below.