BBC Points of View had a piece on Merlin again with a clip from 5x07 - Hopefully someone will upload it to Youtube:
Anyway here's what was in it:
- More startled horses - this time Arthur's by some kind of smoke bomb, and he is thrown off. Seems to be alone with Gwen and Merlin - on the way back from the picnic scene mentioned before perhaps?
- Merlin shouts before we see a character I don't recognise running out of the woods towards him - Arthur pulls out sword
Not spoiler related but also we hear a bit from Katie (Morgana), Alexander (Mordred), and Rupert (Leon) about how the show is coming along - they also show an opinion from the message board about how they could continue the story - although we don't here any direct response to that.
For people in the UK you can see it on iPlayer:http://www.bbc.co.uk/iplayer/episode/b01nwrcr/Points_of_View_2012_Episode_19/
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