Extremist Protestant, at least for a while. If there's a serious rebellion, which I suspect there will be, it may prompt something of a rethink on the part of the King. Then again, given the fact that Edward's father was never put off by revolt, it seems unlikely his son will either. The best way to moderate Edward is probably to have him marry a French princess, which I think was on the cards around the time of his death anyway. Could be wrong on that, though.
Edward has plenty of time to produce two or three children, though, and if he dies at forty, his heir should be in his early teens at least, which helps with the stability of the Tudor dynasty.