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Thanks to Lizzie for spotting the new Robin Hood trailer on Yahoo - with a glimpse of Matthew as the Sherriff at 1:20.
It's not in English, but it has new scenes from Robin Hood. Unfortunately, there are no views of the Sheriff/Matthew Macfadyen.
You can view it HERE.
Thank you Luce!
Edit: here is the English version:
Thanks to forum member, amelie, we have new behind the scenes video from the filming of Robin Hood.
If you look carefully through the trailer, it's possible that this image is Matthew Macfadyen playing the Sheriff of Nottingham.