User blog comment:Morganaforever/Arthur and Morgana/@comment-5036924-20111221183343

Haha, to me it's pretty clear that they changed direction drastically between S1 and S2. They were definitely going for the Arthur/Morgana suggested romance - I mean, Gwen said that line about hoping Morgana would be Arthur's queen one day, and in the original script of Excalibur there's a bit where Morgana basically tells him she loves him. And there was just all that open flirtation like the armour scene and all the sexual-tension-filled-glances which definitely don't emit brother-sister vibes. x.x It all looks pretty weird in hindsight and not really suitable for a family show, which suggests very much that it was a later development.

There's an interview with Bradley James somewhere that pretty much agrees with the fact that there was blatant abandonment of the ArMor thing, and it had to do with a) giving Gwen something to do b) avoiding even pseudo-incest with foster sibling romance and c) pushing the legend out in the more conventional family-friendly manner. They sort of switched Gwen and Morgana's place in Arthur's heart, I think, because they realised that they were risking taking Arthur/Morgana too far for Arthur/Gwen to come out properly. So they had to smother the relationship in a rather ham-fisted move.