There's an interesting report from ETNews stating that OLED TV producers (LG and Samsung, at the moment) will focus on UHD resolutions on their OLED TVs. It makes sense because OLEDs are marketed as premium TVs, so they cannot have LCDs have any advantages except the price.
ETNews says that Samsung aims to re-enter the OLED TV market and release 55" UHD OLED panels by the end of 2014. This will be great, if only to show that Samsung did not really exit the OLED TV market. Samsung does face some technical challenges, and even if they do release UHD TVs, they will probably not be able to really mass produce them and so prices will be high.
LG already has UHD (4K) OLED TVs on the market - both 65" and 77" panels, currently available only in Korea and in the UK.