Because the game is not up/open yet.
Also, I will note that when it does open, on the 21st, that it opens from the website. Meaning you log into the website, and hit "Game Start", for the game to open up ( patcher n' all. ). <; That is why it connects you to your web browser instead.
The website that "doesn't open" is actually the main site ( www.getamped.com
), and is currently down for unknown reasons.