If you’ve been hoping Canon will produce a high-resolution professional mirrorless camera, then you’re in luck. Rumors that Canon has been working on a 70 or 80-megapixel mirrorless camera have been swirling for months, but several new pieces of information make it more likely than ever. First, Canon has filed a patent for an 83-megapixel sensor, which may be at the heart of a new mirrorless camera body. Second, someone claiming to have a prototype of the new camera…