I am not shure, and i belive here they will answer us for shure.

What i did understood, is Catalyst V4 has a PixelMAD implemented.
So basicly you have all the CAT3 functions, 2 more layers, some more stuff and a PixelMAD included (included in the software).

I also undrstand if i need only PixelMAD, i can get it from them directly, without need HES. But getting v4 gets you CAT and PixelMAD all togheter.

Please let us know if i got it right.

BTW Cat v4 is not available yet, HES said arround April.