Instead of being announced in a normal way, Google had to be all hip about it and leak a web comic (I kid you not) to Blogoscoped. As they explain:
It will also have more common features like anti-phishing protection, tabs (no, really?), window-less web applications,
porn-mode privacy mode, and much more. The browser will be released for Windows today, Linux and Mac versions will follow later. Screenshots have already leaked, and sadly, it seems as if Google is using their own theme for the application's buttons and window borders, just like Apple did with Safari. Too bad.