This is rather confusing. Despite the grandious tone of Bush's speech, it is difficult to figure out the practical implications of his rhetoric in terms of policy change.
I don't think it's a policy change. Bush merely said that America sides with those people who sponsor and try to expand freedom. That doesn't mean anything more than that the US will support those people in a variety of ways depending on the circumstances--militarily, politically, economically. I think this has been our policy for a century, as Wolfe points out with TR. But at this time I think it was vital to restate that old goal.
That's the whole point. There is no policy change. Only a changing world to redefine it.