Samsung have been working on curved screens for a while and now even showed a prototype at CES this year. The Korean manufacturer could be on the brink of releasing a consumer product that features it! "Youm" could feature a 5.5-inch (diagonally) curved OLED display, but it could appear more compact given the curved surface with estimates putting it closer to today's 5-inch phones.
No technical details have been released but given Samsung's desire to to show off this cutting edge tech we would be very surprised if the hardware was not high-end.
We'll keep you posted as more details emerge.