SlowMo Ease in GreenSock Animation Platform v12 - From http://www.snorkl.tv/2012/03/introducing-the-slowmo-ease-in-greensock-animation-platform-v12/
import com.greensock.*;
import com.greensock.easing.*;
//use the default SlowMo ease (linearRatio of 0.7 and power of 0.7)
TweenLite.to(mc, 5, {x:600, ease:SlowMo.ease});
//Configure a SlowMo ease with 50% of the tween being linear (2.5 seconds) and a power of 0.8
TweenLite.to(mc, 5, {x:600, ease:SlowMo.ease.config(0.5, 0.8)});