There are so many great things about this trailer. But the best, of course, is her hair. I'm glad to finally see fellow curly-haired people getting a look in in character design - especially in Pixar's first female protagonist!
Now I haven't researched the topic deeply, but my general thoughts are that Pixar would be fully aware of certain visual resemblances between the two films, and I have no doubts that Brave is going to be an excellent - and completely different - experience.
Either way, some of the designs are excellent, I'm looking forward to seeing some in-depth concept art. I'd recommend you have a look!