I'm sure this isn't the spot I should be posting this, but apparently my brain is broken because I can't think of this phrase and it's driving me CRAZY. I'll accept any wrist slap deemed necessary if it gets me an answer.
So... when one team figures out a "secret" that most of the others haven't opened their eyes to yet.
Like how the A's were all in on OBP instead of average. Or maybe some teams figured out exit velocity and how to make use of that info before other teams. Every time there's a new thing like that they say....
"Exit Velocity is the new ________"
It's something like "inequity" or "inbalance" but that's not it.