Taiwan's ITRI institute says that OLED TV shipments will outpace UHD ones by 2015. While in 2013 only 50,000 OLED TVs will be sold (compared to 500,000 UHD ones), in 2015 OLED TV shipments will rise to 3.24 million compared to 3.2 million UHD TVs. In 2017, ITRI sees over 10 million OLED TVs sold compared to only 6 million UHD TVs. It's not clear how they count UHD OLED TVs...
ITRI explains that the dramatic OLED TV market increase forecast is based on improving yield rates and more companies joining the OLED TV market. UHD on the other hand is limited because it's only useful in panels 50" or above (which is not entirely true. Panasonic for example unveiled a 4K 20" tablet display which they will start producing soon).
ITRI's forecasts are quite similar to the forecast given by LG Display's CEO last week. LG sees a very small OLED TV market in 2013, and they expect it to grow to 600,000 - 700,000 units in 2014. In 2015 it will grow further to 3 million units (or about 1% of the total TV market). DisplaySearch is more optimistic than LG and ITRI, saying that the OLED TV market in 2014 will reach almost 2 million units, and in 2015 it will reach almost 5 million units.
