While they're shown the controller, I think right now Sony is aiming for a system box that will be just slightly bigger than the first PS3 "Slim" model.
Don't be surprised that the PS4 includes two new features:
1. HDMI 2.0 support to interface with 3840x2160 resolution "4K" displays at upscaled resolution even at 30 frames per second (HDMI 1.4 supports 3840x2160 only at 24 frames per second).
2. 802.11ac Wi-Fi adapter support, especially with the expected drop in 802.11ac Wi-Fi routers later this year.
Don't be surprised that the PS4 includes two new features:
1. HDMI 2.0 support to interface with 3840x2160 resolution "4K" displays at upscaled resolution even at 30 frames per second (HDMI 1.4 supports 3840x2160 only at 24 frames per second).
2. 802.11ac Wi-Fi adapter support, especially with the expected drop in 802.11ac Wi-Fi routers later this year.