Not just "included", but according to the linked post, Opera now uses DuckDuckGo as the default search engine. That sounds like a major win for them.
Good PR piece, but I'm skeptical it'll translate to any extra traffic.
DDG was in Times 'The 50 Best Websites of 2011', now they show up in Opera. It does not seem to be so spectacular as being listed in Times, yet its gonna stay there for a long time, being one click away. It should translate to extra traffic in a long run.
Seems DDG is in a phase of building momentum which can take quite a long time and includes such (not so small) wins like these two.