NO only in digital not HD. That pertains to ota stations not cable or satellite. So your ota locals will be in digital but it could still be 480i.
BUT, more channels, if they know what's good for them, will be switching to HD anyway, because you can hardly find an SD TV anymore, and SD picture quality is anywhere from fair to complete crap, depending on bit rate, when scaled up to an HD display of any decent size. (Unless you buy a video processor costing more than a large mid-quality TV.) So in effect, HD will be the new norm, and thus the providers should not be treating it as a premium service!