The Opera Mini team recently responded to an inquiry about a version of the browser for Windows Phone and sent back an intriguing message saying that the engineering team has Windows Phone on their list and will make an announcement as soon as it is ready. That sure sounds to our ears like the app is being worked on as we speak. As of February, there were 300 million people using Opera Mini and you might see that number grow nicely if a Windows Phone app is added. Last October, Opera did confirm an interest in porting Opera Mobile and Opera Mini to the Windows Phone platform.
source: WP-Hub via WMPoweruser