I saw on the WP 4.0 road map that WP 4.0 was supposed to come out on the 28th. Tomorrow.

Now I see September 3.

What delayed it?

My birthday is on September 1. What better gift to a WordPress geek (who is currentlly wearing a green WordPress t-shirt as he is typing this comment) than have a new WP come out a few days before his birthday so he can geek out on WordPress.