As I speculated combo videos, my first stop was the EVO combo video that was shown last EVO (forgot when XD) and tried to do the combo's shown but some were just not achomplishable. If you looked at the combos closely for a few characters, the attacks have different effects or character having different abilites.
Heres the video for you to see:
Sweet Tooth was able to cancel O.O but now it is unavailable. . . Why?
or Big Daddy's air Incinerate (neutral circle) had a stun effect that now is a hard knock down.
There are a few that are understandable that I can see why like Toro's dive kick (Oni) would place you in a crumble state, leading you into a super but is now a hard stun. However the stuns from Toro's justice attacks are less than shown which I guess are balanced but could have alot more combo potential.
I assume there's more but these were the character's I noticed the most from this video.
I noticed what you were talking about and i absolutely agree that the forward stab should conect just like his up slash, Weird choices Superbot is making with a few of these characters.