The new one is a complete (or near enough) rewrite of the lemming class. Each lemming is a simple referenced object by the instance, with its own properties and controllable by the instance. The array index of each lemming is the key to a number of pre-defined methods that can help do the storyboard example (along with events the instance or the lemmings fire).
You can view the source and play with them here on jsfiddle: http://jsfiddle.net/dimitar/bYtLz/. The storyboarding was a bit messy but the code is fairly simple. Change var letters =  to spell something else. Have fun!