It says new build coming as soon as tomorrow, not that a new build is coming tomorrow . The former is a much safer way of saying it, because either way you are correct! . The real question is, what will the build be? Build 14317.1000 is currently the latest known. I would think it would be one of the later builds to ensure as much bug-fixing goodness as possible is in the next build. Because of the BUILD conference and the psychological effects of the build number changing, I suspect they are aiming towards a rather smooth Windows experience. Obviously not perfect being a beta build, but something that heightens confidence in users.
Not to mention any build that comes next will be of the anniversary update probably why it had taken a little longer then usual.