As far as I know there are no published numbers yet on the takeoff weight. Maybe there will be.
Yes you are correct. They have not published the actual airplane weights. And you are correct in saying they probably not near tire speed limits upon rotation. However, techniques around here would amaze a person. I was using that as a example of what could cause a nose wheel tire to explode. Many many other factors have been known to chase a nosewheel tire to expand and explode in the wheel well.