Well it looks like there will not be a Merlin Season 6 nor movie, because Bradley James doesn't want to do role anymore. The sad part is Bradley admitted that he lied to everyone but didn't know how to say it. This is the interview from digital spy

I participated in Round 37 of merlin20in20. We had to pick a pairing and I did Arthur & Gwen. The voting is now open! There are some amazing entries, so go vote for your favorites! लिंक्स to the other voting लिंक्स below...

Very well-written and thoughtful review of Merlin Season 5. Contains spoilers.