The amazing Optimy Rig was created by Gary Wee. His website is http://www.gwpixel.net and I'm sure he has a lot more amazing stuff coming.
This is an animation I created with game-animation in mind.
Imagine Optimus is on a treadmill, and he's moving forward at full speed, jumps, transforms mid-air, lands with a slide, recover. A future version of this animation will be with Optimy driving on a road, then performs the acrobatic transformation. The rest will play out as it is now.
Any comments and critiques are welcome. For further inspection, you may download the animation as well. Enjoy!