Bad information is worse than no information at all. It would be better to provide an accurate link to another page or a phone number to call. When you add information to a page remember that it must be accurate and be maintained. Do your users really want to wait for it every time they visit your page. Don't include them unless they are really needed.
Most users know that the web is always under construction.
If you page isn't ready, then don't post or link to it. This area is typically about 600 x 440 pixels. It is fine to extend the length of the page, but never the width. This is to avoid horizontal scrolling, another major frustration to user. The font you use should be easy to read on a 14 inch monitor.