Features to be expected with beta 3 release:

• Fixed a bug with smart rotation
• Added rotationProperties static property to specify properties to apply smartRotation to
• Fixed bug with proxy method calls not returning the return value
• RoundValues renamed to useSnapping
• Added snappingProperties static property to specify properties to apply snapping to.
• Fixed a bug that could cause setSize to be called twice
• Fixed a problem with copyInitProperties firing too many times
• Made the data parameter on addProgressPoint optional
• Changed removeProgressPoint to accept an optional data parameter
• Rewrote the progress point logic, fixing a problem that would prevent progress point events from firing if more than one progress point was passed in a single tick.
• Progress points will no longer fire when doing manual positioning, including using position=value, beginning() and end().
• Made it so that autoHide only applies while tweening alpha.
• Added a defaultEase static property, which allows you to define the default easing function for all new tweens
• Made linearEase a public static method
• Added useSetSize property to allow you to turn off the setSize behaviour if necessary

Developer Oriented 

gTween is built for ActionScript 3 developers from the ground up. It uses a more conventional instance-oriented model, rather than a static interface.

Proxy Tweening

gTween provides a unique proxy property that allows you to work with tween destination values the same way you would work with them on the target object. 

Interrupting Tweens

With gTween, you can modify your tween while it is playing, and it will attempt to accommodate those changes.

Sequencing Tweens

gTween provides three features to allow for sequencing multiple tweens: child tweens, delay, and nextTween.

Timing Modes

Another unique feature of gTween is support for multiple timing modes. You can use the common time based timing, frame based timing, or a hybrid timing model.

Pause All

gTween offers a class level pauseAll property that will pause all tweens, without affecting their per instance paused property. 

Robust Events

gTween offers three built in events: an activate event that lets you know when a tween starts running, an init event that fires when the tween finishes delaying and starts tweening, a change event that fires each time the tween updates, and a complete event that fires when it reaches its end.

Resource Management

gTween also uses a couple of strategies to allow unreferenced tweens to be collected when they are no longer needed, while preventing them from being destroyed when they are needed.

Be sure to check out Grant's blog for more information on gTween.

Additional Resources:

• Sequencing demo
• Simple performance demo
• Download gTween