I don't think so, I'm waiting patiently for it too. Enjoying UC browser meanwhile!
UC browser has the same - lets call it- "backend Code" as IE, actually all browsers and camera in the store have the same "backend Code" , only the layout changes.
Microsoft only lately allowed developers to code their own camera and web browsers "backend Code" apps.
Opera Mini runs off from a cloud based system so it won't necessarily use the IE engine