According to Reuters, Samsung Display plans to invest $3.6 billion in a new OLED fab from 2015-2017, aiming to make small and medium size displays. Samsung did not release any information regarding the type and capacity of this fab.
One option for Samsung it to build another glass-based OLED fab. The company aims to reach OLED-LCD cost parity for small-sized displays towards the end of 2015. If this happens, it's likely that OLED prices will drop below LCD by 2017 (especially if more capacity is added) and thus demand for AMOLED displays for mobile phones and tablets will soar. Samsung increased their 5.5-Gen capacity from 10K substrates per month to 140K/m from 2009 to 2013.