No, totally. When I suggested it this was a part of an entire package of new controls called Pro Control Defense that included a catch button, squaring up to fly balls (to center up or for players tagging up), a sprint feature, fake-throws, a momentum system for throwing, and even shading the sun. Tagging was just the icing on the cake with all of this, and it was essentially a set of "advanced controls" much like 2K had as an option in hockey games.
I just don't see how a "new tagging system" or whatever would be a back-of-the-box feature of something for gameplay improvements that would be something which we would notice if they didn't tell us. Sure, we could say "Oh I saw a new tagging animation the other day," but I don't ever recall tagging really being an issue of mine in this game. Sure tags are missed sometimes, but that's just a part of the sport. Unless they do something like cancelling tags (ducking out of the animation for other play) or something like moving around the bag for hook slides as I said earlier, it's tough to figure out how this will change gameplay.
EDIT: Actually, what might be nice about this feature mixed with the Human IK Engine is the game might be able to recognize when the glove actually touches the player, so maybe this game will have a challenge system where you can challenge actual missed/late tags, etc. That would be cool.