The El Gato glitches are irrelevant, I don't even know why you brought them up if you knew how they were done. And I am not sure what "new tech" you have seen on stream lately.
The game is figured out in the sense that people are going to win by refining their play, not be figuring out some new tech. And no I am not talking about some year old tech that was debuted on stream by a player and the stream monsters start crediting the top player for figuring out "new tech".
The stuff to figure out is player tendencies... not character tiers/strengths. There is no hidden tech that is going to make Hsien Ko a competitive character just like there isn't going to be new tech that makes Vergil irrelevant.
The only thing is going to change the game are the mid-tier/under used characters in the game, after a while people are going to make sure they counterpick the Morg/Doom shells after someone finds a good team to beat them out. Or find the one character that can stop Zero(Besides himself)
Also Thor, Jill, Viewiful Joe, and Trish might be finally starting to see more getting used finally, but, we will finally see more Firebrand, Rocket Racoons, Super Skrull, and MODOK getting seen, and it MIGHT change the metagame a bit(Not the Zero, Doom, Vergil metagame, that is here to stay)
Also, I do believe someone might find the best Phoenix Wright team, and make him almost guaranteed to get turnabout mode every game(But it will be found out one month after MVC4 gets released)