ST заикнулся о корпусах с 20 ножками: http://www.st.com/internet/com/press_release/p3275.jsp
Full production is scheduled for the beginning of Q2 2012, and the devices will be available in 32-pin UFQFPN32, 48-pin LQFP48 and 64-pin LQFP64 package options with 20-pin and 100-pin extensions soon to follow.