This morning we've gotten word from an anonymous source that the Surface Pro 4 will be revealed at a special Microsoft event in mid-May. This follows with last year's announcement of the Surface Pro 3, having taken place on May 20th, 2014. When we got our first Surface Pro 3 hands-on back then, the device seemed like the bees knees in detachable-keyboard Windows computing. Now just one year later we're itching for the next generation. Especially considering the short amount of time between the Surface Pro 2 and 3.