Images of what possibly could be a Nokia branded Windows tablet have surfaced at an event in Pakistan where Nokia launched the Lumia 620, its mid-ranges Windows Phone 8 powered smartphone. The picture, which was first posted on Twitter by Farhan, shows the stage screen with the presentation slide displaying a picture of the Lumia 620, a large PC screen and a tablet-like device snuggled between the two. It appears that the tablet has rounded edges, a thin bezel and a green or yellow colour casing.While it's hard to comment whether it might be an actual Nokia product, a prototype or simply a place holder to highlight the Microsoft Windows ecosystem, it has definitely set the rumour mills abuzz about the Finnish handset maker...