The "immersive browser" is a unique Metro UI-style browser, with basic functionality as of right now.



From Neowin.net:

Not too much is known about the browser yet, but based on reports and screenshots that have leaked onto the web, the browser offers users a very limited UI and navigation bar. With only a couple of options including the back and forward history buttons, an address bar with favicon, a refresh button and favorites, the browser offers a compact browser without all the unnecessary bloat.

  Windows 8 immersive browser images surface