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I cannot tell from the Opera Desktop team blog or from the Presto Wikipedia page if Opera 12.15 is utilizing the WebKit or Presto rendering engine. The phrasing from Wikipedia can be interpreted either way:

It [Presto] remained in use until Opera 12.15, when the browser's developer Opera Software ASA began phasing Presto out of its products in favor of the WebKit layout engine and V8 JavaScript engine combined with a modified Chromium browser.

Is Opera Version 12.15 using WebKit or Presto?

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up vote 1 down vote accepted

12.15 is still using Presto, but it's being phased out after 12.15 in favour of WebKit Blink, a WebKit fork.

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Actually it seems that Opera will switch to Blink (a webkit fork). – user555 May 2 '13 at 20:44
Thanks @user555 I've updated the answer. – nathangiesbrecht May 2 '13 at 21:19

Opera officially confirmed that they will follow Google with Blink.

"Google on Wednesday made a huge announcement to fork WebKit and build a new rendering engine called Blink. Opera, which only recently decided to replace its own Presto rendering engine for WebKit, has confirmed with TNW that it will be following suit."

Source: http://thenextweb.com/insider/2013/04/04/opera-confirms-it-will-follow-google-and-ditch-webkit-for-blink-as-part-of-its-commitment-to-chromium/

According to user rafaelluik and his comment Opera 12.50 was renamed to 12.10. But there seems no official statement when they start to implement it.

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