Ajith's 'Aegan' movie still was reused and the head was cropped and fixed in some other's body and to make sure that the image doesn't look like Photoshopped they gave retouches to the mustache and the beard.
Fans who are over excited couldn't see the bigger picture. Director Siva and 'Thala' Ajith are working relentlessly to give a solid commercial product and we have to wait at least a few more months to get some official updates. Kindly refrain from Photoshopped fake updates until then.