Well, that was a good, attention-grabbing start. I rather agree with Cocoa_girl that a coatl, a winged snake, would be an excellent animagus form for Harry and would fit him well; failing that, something both winged (to fit with his flying ability) and reptilian (to go with his parsel abilities) would fit (not necessarily a dragon, but there may be other winged reptiles that'd fit). Whatever Daphne's form is, I'd hope it would reflect her coloring and nature (I'm thinking some solitary hunter, most likely a large feline).
It should be interesting to see how matters proceed from here.