Although there has been an unofficial ENGL Powerball called the German Gain model in the IK Multimedia Amplitube Custom Shop for some time it is now an officially licensed ENGL Model along with the ES650 which can create classic rock to high gain tones.

Here is my demo of the German Gain model but using a 3rd party cabinet emulator: http://youtu.be/02QOJpp8NKY, as you can hear it is a bit of a beast!

For more info check out http://ikmultimedia.com.