Found this at io9.com and it says in the caption its from the episode "First Contact" could this be the new alien race we've been looking for?
Here is the io9.com link
http://io9.com/photogallery/stargateupcoming/1003451658
Spoiler:
Here is the io9.com link
http://io9.com/photogallery/stargateupcoming/1003451658
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