Well, using what we've seen from previous Zelda titles, including OoT, MM, WW, and TP, the main form of transportation (boat, horse, etc) always has some sort of combat. And seeing that the bird will probably be the main form of getting around in SS, we can assume that there will be some sort of ability to fight off of it, whether it be shooting arrows or throwing bombs, we don't know yet. I'm pretty sure in one of the trailers also, Link was seen facing a big monster while on his bird (while flying), and of course that will need to be fought off somehow. And on "bird armor", well we know already this game will be having a huge upgrade system as well as the ability to make your own items , so perhaps there will be the ability to make some sort of bird armor? We have been seeing that in the recent DS Titles like PH and ST where add ons could be put on your boat or train, so we'll just have to wait and see!