The Olympus EM-1, an unannounced new Compact System Camera, is the latest Olympus camera to hit the rumour mill following a spate of leaks and now comes a diagram from someone who claims to be testing the camera.

Details of the new camera, published by and expected to be announced in the next couple of weeks, shows that the camera will have the usual features as previous Olympus cameras, but feature a newly designed AEL/AFL button/level and see some of the buttons rearranged on the back.

It’s not the first time we've heard of the EM-1, but this, combined with previously leaked specs, all help build a picture of what we can expect in September.

According to current speculation, the EM-1 will come with a DSLR-like design similar to the E-M5 but with a larger grip that will contain an additional control dial on top. It will feature an Olympus Micro Four Thirds mount and come with a 16-megapixel sensor, a whopping 81 AF points, and a 3-inch tiltable LCD screen. It will also have built in Wi-Fi.

That's all there is at the moment, but with a launch expected soon, we shouldn't have long to wait for the real deal to appear.