Version 12.16 of Opera contains only a minor change, to the code signing certificate.

It appears that the classic Opera browser is soon to become extinct. Opera’s developers decided to toss out their distinctive browser and the ‘Presto’ engine on which it was based. Instead, starting with version 15.0, Opera will be based on the Webkit engine. As a result, Opera 15.0 is virtually indistinguishable from Google Chrome. If there’s a specific reason you’ve avoided Chrome in the past, that reason now applies equally to Chrome. For instance, Chrome has no sidebar feature, and now neither does Opera.

I have been unable to discover how long Opera’s developers will continue to update and support the 12.x series browser.

Opera version 15.0 is now available, but I can’t bring myself to recommend it. If you want to try it, just look at Chrome.