Hi,
yes, right, Android 3.* has support for CSS 3D transforms, but unfortunately a very buggy one,
I have an Android 3.1 tablet (Samsung Galaxy Tab 10.1) and there the cube faces are removing and rebuilding automatically sometimes when panning around and when doing zooming then the pano will be 'away' and it will take around 2-3 seconds until it will be there again,
you can force to use the krpanoJS viewer by using -
useHTML5("always") - during embedding,
to see if or how the CSS 3D transforms are working on your Android device,
I have uploaded here a pano where the krpanoJS viewer (HTML5) is always enabled - you can use it to test your Android device:
http://krpano.com/html5css3dtest/
fixing/working-around the current CSS 3D transform bugs is not possible - Google itself needs to fix that,
about Android 4.* - I have not tested or seen any Android 4.* device yet, so I can't say much about it yet,
best regards,
Klaus