Opera 10.5 has leaked to the web ahead of its December 22nd release. Along with a new interface, the browser offers better compatibility with Windows 7, private browsing, and a new rendering engine that should provide for faster web browsing.
A screen shot of the updated browser is posted below and provides a similar look to Google's Chrome. Opera has stated that the screen shots posted below are legitimate but are from an older build according to techie-buzz.com.
Image Credit: techie-buzz.com