According to Korea's Naver portal, Samsung is developing two new tablets that sport AMOLED displays - an 8" one and a 10" one. One of them will be launched together with the Galaxy S5 (which may go into production as early as January 2014).
Samsung's AMOLED tablets will be high-end ones, aimed to grab market share from Apple's new iPad and iPad mini. Samsung will continue to use LCDs is low-cost and mid-range tablets. Until these new tablets are launched (if the story is correct), the only OLED tablet by Samsung was the the 2011 Galaxy Tab 7.7 with its 7.7" Super AMOLED Plus 1280x800 display.
Back in March 2013 DisplaySearch estimated that Samsung will soon adopt AMOLEDs in 7" to 8" tablets.