Well there was some "vague" info in Mearls Reddit AMA.
As an aside... I know of at least 4 companies waiting for the final word on 5e OGL...
We'll see what kind of legal recourse WotC has to stop this kind of infringement. If a company tried that kind of stuff with Microsoft, they would destroy that company or buy it. I doubt WotC has the legal resources to pursue it that aggressively, but Hasbro might. We'll see how zealous they are about defending their product.
I don't mind OGL personally. I think it's better for the fans of gaming. More minds creating content makes for a better game from a fan perspective. I'm sure Mearls and game designers would prefer OGL. He seems like a gaming fan as well as designer. He has business people to answer to. They will make the decision on the matter including how aggressively they will move to hammer companies like Frog God games attempting to apply the old OGL to the new game.
Hell the lawyers fees are probably more than any "losses" that WotC might incur from what Frog God games did.
But that's not really the point. I'm watching what Frog God Games and friends are doing, and if it comes time that I release something for Pathfinder, it might behoove me to try and cover "Fifth Edition" too. (That is mostly hypothetical but possible.) If WotC comes down on Frog God Games, anything but a complete victory for Frog God Games is probably going to mean that I wouldn't do that. For the price of one lawsuit, you can scare away a lot of people.
Hasbro only cares about the big stuff, Movies, video games, "ie" things that deal with millions of dollars. Hasbro doesn't give a rat's rear about some kickstarter that ultimately doesn't stop people from purchasing the core 3 books. Hell the lawyers fees are probably more than any "losses" that WotC might incur from what Frog God games did.
Some of the other smaller outfits I'm not so sure about, as I'm not very familiar with their products.