The Verge: Nokia is building its own Windows RT tablet that is set to debut in early 2013. Sources familiar with Nokia's plans have revealed to The Verge that Nokia's tablet will include HDMI and USB ports and a 10.1-inch display that's similar to Microsoft's Surface RT screen. Nokia's tablet will also include cellular connectivity and we understand that AT&T will be one of the first to stock it in the US. (Gadgets, Nokia, Windows tablet)