[Tween an array value]

Actually, JavaScript is crazy flexible (uncomfortably so sometimes), so I'm pretty sure you can do this:

var a = [1,2,3,4];
var b = [0,0,0,0];
b.onUpdate = function() {
	console.log(a[0], a[1], a[2], a[3]);
};
TweenLite.to(a, 2, ; //tween the values of a to those of b over 2 seconds, and log them to the console.

Arrays are just objects whose properties are named numerically instead of using strings. 

Brilliant!