Update: New 3DS screens also added.
Original Story: The official Sonic Boom website in Japan (Sonic Toon) has been updated and with the update comes some new in game screenshots showing Metal Sonic and Shadow in action.
Other screens show some in game story/action sequences and we also get our first Wii U appearance of Sticks. You can find all the new images in our Gallery, or head over to the Japanese Sonic Boom website for all the information.
Source: Sonic Toon website.