User blog comment:WitchOfCamelot/Questions/@comment-5498755-20120914150352

According to the site, the air date attached to the Episode 1 photos is Week 41 (6-12 October by BBC's week count)  http://merlin-network.livejournal.com/357457.html.

A tweet from @leeloo2902 '''Bradley waving at us feels like a goodbye.... He said he was sad to leave. #Pierrefonds #LastDay http://lockerz.com/s/243953871 '''

For news + supporting the tweet above: Last filming day at the castle in this block, and if rumours are to be believed, the final Pierrefonds filming day ever http://merlin-network.livejournal.com/357791.html.

And the "rumour" of Season:5 being the last was caused from the multiple tweets that came out from crew members of Merlin. Due to the number of different sources it has caused people to panic. http://merlin-network.livejournal.com/356261.html

We just need to remember they said http://seriable.com/merlin-series-6-talks-confirmed/ that its based on the audience's appetite.

Considering from the plotlines I have read on the last two episodes of Season:5 I really do think we will have a Season 6 but we will have to wait and see as it is based on the fanbase.

Sorry for all the links but they will help you get up to date as every single one of them besides the (Merlin:S6-Confirmed) have been posted within the last 5 days and are full of information.