Ok seriously people? We finally get something concrete to discuss and speculate about and no one has more than a single sentence to say about it? Instead you go on raving about more goddamn evolutions and eviolite.
A new battle mechanism that allows your Pokémon to become even more powerful when the bonds you share grow stronger.
A new battle mechanism. As in a mechanism that affects things IN BATTLE. If the wording is not a translation error or miswording of some sort (possible, the guy's first language is Japanese), that means we're getting something new that actually affects battles directly. I can't possibly see this just being a new way of raising already existing stats; that's a new way to raise your Pokemon, not "a new battle mechanism".
What it almost certainly does mean is one of two things:
1) A new stat replacing or supplementing Happiness that has a more active role in battles.
2) An existing stat or mechanic (most likely Happiness) being changed to have a greater impact on battle.
Depending on how this is implemented, it could fundamentally change the way battling works or just give us another stat on our simulators to set to max before we go into battle. In game, it could negatively impact some old ways of playing and positively impact others.
This is the biggest thing to have been announced by far so far, at least to a competitive community like Smogon. This has the potential to change everything as deeply as the addition of abilities, or to change nothing at all.
In short this is the best goddamn discussion fodder we've been given since they announced it and by damn, I'm going to discuss it.