From the way its going I'm almost expecting that the prince is her brother's kid.
That's the impression I got, too. The fact that he looks like an inbred mutant kind of drives the fact home.
I'm also guessing Joffrey was the one who hired the assassin. I mean, the assassin was completely incompetent (he couldn't even kill an old woman), which is someone I doubt the less-than-incompetent Jaime would have hired. And considering the events in the beginning of the episode, where Tyrion bitchslapped the inbred mutant and the Hound told him that Joffrey wouldn't just let that slide, it seems fitting that he'd give the assassin Tyrion's dagger just in case he did get caught. Sort of two birds with one stone, and just the kind of thing a sniveling little twat would do. Couple that with the fact that he made an off-hand remark about it being a mercy to just "kill the boy," and it all makes sense.
Anyway, what I think I loved most about the episode was the ending. That swashbuckler guy is absolutely fantastic, and I'm guessing Arya (is that her name? I can never quite hear it right) is going to become one of the main "heroes" of the story? I really hope that's the case.