Opera 10.5 Pre-Alpha Drops on December 22, 2010.

The first taste of the next iteration of the Opera browser is just around the corner. Opera Software is currently cooking a preview version of Opera 10.5 and is gearing up to make available for download a pre-alpha build of the browser next week, a few days ahead of Christmas. Details are scarce at this point in time, but from the little information that was shared with the public it appears that the next generation of Opera will apparently be designed to offer as much horsepower to end users as possible.
“While everyone is off for Christmas vacation, the desktop team is working hard on preparing a nice holiday gift for Opera users. On December 22nd we will release a 10.5 pre-alpha. We'll keep it a surprise for now, but the keyword is: speed,” revealed Opera’s Huib Kleinhout.

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Opera 10.5 Pre-Alpha Drops on December 22, 2010 - With additional horsepower - Softpedia

Opera's a decent browser, but they've only recently gone from 10.01 to 10.1 and there's no way a pre-alpha build will be remotely stable... so I'll be stuck right where I am, with a final version...