The E-M1 uses the same screen as the E-P5 - a 3:2, 1.04m dot LCD panel that gives a slightly-wider-than-VGA 720x480-pixel display. The 3" capacitive screen tilts 80° upwards and 50° downwards, and a ridge down the left side makes it relatively easy to pull out and adjust. Like all tilt-only screens, though, it adds nothing when shooting stills in portrait format.
One really welcome change compared to the E-M5 is that the moment you tilt the screen, the EVF's proximity sensor is disabled. This means that the camera will no longer switch over to the EVF if you move it too close to your body, which counts as a big improvement for waist-level shooting.