Jax still has great buttons, specials, wake ups, mix ups, etc. Gotcha Extreme can be used for armor break/counterpoke/reversal/wake up all while doing a lot of unbreakable damage. Dash Punch, like many other armors in the game, is now made to be a safe on block move but can be punished on a read. Examples are Liu Kang's Dragon Fist, Kano's Up Ball, Cage's Shadow Kick, etc. If you think the opponent is scouting out your dash punch then make it an overhead. The wake up game is now based on reads and incorporating all of your options, as it should be.