Bai du china has outed several upcoming Nokias before and another sighting is of the Nokia Asha 308/309.
Nokia 308 is a dual sim wifi where as 309 is a single sim-card Wifi handset, full touch screen S40. The estimated configuration are same as 305 and 306 also the product info can be seen above as well as a couple of photos. But it may have chances to have front camera too.
This is either a case to hide the handset or it has a very thick, rugged design or may be it is silicon cover on the phone.