been messing with this knockdown in training against gl for awhile and i've found something pretty neat that i haven't seen posted (didn't really look either).
after the knockdown when you go to jump and input the 1, if you time it early enough, the 1 will actually NOT cross him up and you will land on the other side and still be able to combo a la seth from SF4 . this makes it EXTREMELY ambiguous and that much better in my eyes. now for the bad news...
1. only tried it against gl and i can guarantee that this wont work on a grip of characters since the cross up is already character specific anyway.
2. this isn't a true mixup due to the fact you can always wake up crouching to force the crossup and block it normally. although, my first reaction when my opponent jumps in at me isn't to crouch ;p