Regarding the new orbit... From what Elon Musk said at the press conference, I think they fired the transfer stage for max duration just to see how far it would go, longer than would be necessary for a mars flyby. Apparently the onboard batteries are good for just 12 hrs so once it's on its way, they can't track it anyhow and don't have a way to test another rocket burn for mars capture. So they just fired it till it quit, to see what max performance looks like for that configuration.