*hee* I'm not an IP lawyer and leave the well-informed discussion of potential rulings to them. And I'm not expressing an opinion about the merits of the case. But a few things did strike me about Ms. Rowling's testimony:
First, isn't it a bit strange that she is complaining that this slowed her down and it may take several years before she publishes her next book? Before DH was published, she was saying in interviews that she intended to take a break. And it's not like she wrote all seven HP books in 5 years or something. Indeed, if you ask me (which, granted, you did not), DH could have benefited from having more time spent on it...editing, perhaps?
Second, when you compare the the heroes of Harry Potter and the Prydain Chronicles by saying: there's a young orphan boy, Taran. ... Over the course of 5 novels and several shorter works Taran learns to temper his impulsiveness and curb his hot temper....
It actually seems to me that there is a significant difference between the two series in just this area, and I think Rowling could argue quite convincingly that she just used that as inspiration rather than a crib sheet. In fact, Harry Potter is lionized for NOT tempering his impulsiveness and curbing his hot temper. Does being praised as gallant for torturing a man who spits happen to Taran? Or perhaps plotting to cheat a race when the last time its members were seriously insulted resulted in a war that was so terrible it is still required study material centuries later? ;-) And, BTW, isn't there a bit of irony there? Harry, who Rowling repeatedly tells us is the essence of goodness, plotted to cheat goblins because he thought it was stupid that they would think the sword was theirs just because they made it.
And finally, much mention has been made in the press and by fans about Rowling's apparently struggling to restrain tears. I suspect, however, that it did not have quite the impact the fans think. Spend any time in a courtroom and I assure you that you will see plenty of tears, grandstanding, and purported attempts to restrain tears. Judges and lawyers tend to be a bit cynical about that after a while.