well, at the beginning (from the first videos i saw) hd seem to me just a reissue of pure/pulse mixed up and shaked with next gen graphics. The hud, which you can like or dislike, reminded me of ps1 wipeouts (it's so '90) and all the game has imho that atmosphere, which i really like. so it may be not as fresh air in the series (but it doesn't want to) but it's a wipeout game at 100%..
just my point of view..