Perhaps this is old news and I'm just way behind the times, but I clicked onto Shine's website and they had a shiny new description about series 3:
Series three sees MERLIN return with the familiar blend of magic, monsters and mayhem. But when secrets are exposed and old friends choose new sides, it is clear that the kingdom will never be the same again. Morgana is finally found after months of absence, and none in Camelot rejoice more than the King himself. But Merlin remains suspicious of his old friend and with good reason, for, despite what she may have others believe, Morgana wants only one thing to take over Camelot and shes prepared to do whatever it takes to achieve it. Life changing decisions must be made as the boundaries of love, duty and friendship are pushed to their utmost limit, and the mettle of each character is tested in unimaginable ways. But in an uncertain future, only the strongest will survive.
no lie, I LOL'd at "only the strongest with survive." Also, all grammar issues are as featured on the site.
original link I'm not going to be around after clicking post D: so if there are ~issues~ with posting, apologies in advance!!!