i was told the majority of the changes were internal. they realized that there is no need to shoot 30 balls per second, a capability which was making the guns not shoot very well (relative). so, they tightened all of the internal tolerances, lowered the max bps, and made everything smoother and more efficient.
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They put "Plank Kits" in the noid that slow the ram to make it cycle slower and have a softer shot, you can get this kit from eclipse for your ego9, free. Also added the Cure3+ and the Zick2 kit. I'm sure they made some other small changes but that is about it.