I have to be careful how I word this, but from what I've heard, it's fairly subtle.
There have been rumors and innuendos that the cost to acquire certain pieces goes up, or that the return for certain players via trades goes down. Maybe you don't see quite the bidding wars that you'd expect to see, things of that nature.
Nothing that would lead to accusations of collusion mind you...because we wouldn't want to imply that. But there have been various reports that things became at least a little more difficult. Whether or not that's true, who's to say. But if you were to get a few drinks in people and got them talking about deals that may or may not have been on the table, it does become a more.....popular subject.
Is it true or just a boogeyman story? Debatable.