The Oppo Find X9 Ultra is rumoured to be launched in China soon as the top-of-the-line model in the Find X9 series. Details about its camera system have now been leaked. According to a tipster, the upcoming flagship will feature a quad rear camera setup, headlined by dual 200-megapixel cameras. The Oppo Find X9 Ultra is said to be equipped with a 200-megapixel primary…