My review of the buffs: (Keep in mind nothing is set in stone as none of us have gotten to play around with the character in real matches yet)
I really love the buffs they gave Jason. I strongly feel as if they address some of the many core design issues that Jason as a character struggled with. The D+1 (and other buffs to his pokes) is HUGE and now gives him the ability to poke back or condition the opponent during a frame trap. Being able to choose the side after an EX command grab is also a gem and something that was definitely needed as now it gives you more control as the Jason player with what you want to do. B+3 buffs are excellent and tack onto that very poor follow up counter poke game Jason suffered with heavily before. Now he has a fast true mid attack he can use to hold his ground and gain different approaches depending on what you're trying to go for - Another great well thought out buff. The D+2 was also needed and I'll take that over an anti-air grab buff since his anti airs were so terrible.
Slasher
Making his B+1,2 string faster was the first thing on the list on what this variation NEEDED. It didn't have the footsies or good space control of the other two variations, so now it becomes a force up close with a very fast launching string. This string also buffs up his 50/50 game as now the opponent will be blocking in respect for the string, and that's when you can go for a 50/50. The added help to his zoning also helps since it gives this variation an extra layer his other to do not have regarding full screen presence.
Relentless
The damage increase on this variation is all I really wanted mostly, and that's what was given. Depending on how strong the damage intervals are now, it looks like Relentess may be back to it's former glory. Good to know it's now better than it was before.
Unstoppable
The main reason this variation was so underpowered before was because of the lackluster and subpar healing and damage buff special attacks that it offered. They now completely addressed that and I love the twists they put on some of the buffs like how his damage buff gives Jason armor breaking properties and his heal gives him a little bit of meter. So cool! And once again, very well thought out. This variation will benefit a lot from the meter since Jason has literally almost no ways of building meter and Unstoppable is a very that heavily relies on it.
I'm REALLY looking forward to playing the new Jason and exploring the character once MKXL hits.