Opera has just released their latest browser- Opera 15. They have jettisoned their own Presto engine in favor of the Chromium projects work (basis for Google Chrome and Apple Safari). It is on a rapid release cycle, mirroring that of Chrome and Firefox.
If you are currently using Opera 12.x, it will continue to be supported with security patches and the like for the foreseeable future. You won't be force migrated to 15 at this time.
I just downloaded and installed Opera 15. Basically, it is like Google Blue w/Opera UI layered on top... at least it handles page zoom like Opera and not Chrome (for now)