Why are you so worried about that?! You assume that it would be for 4th Edition even though it's pretty clear Gary didn't want to lose control of his property. The only way I could see Hasbro ever being interested in that is for Gail to sell the work outright, something I highly doubt she would do. And I don't see Hasbro wanting to do that.
At this point, does anyone still actually care anymore about Gygax Games?
The only thing I personally am bitter about is how fans have really treated Gail Gygax over the past few years. Do people honestly think they know what Gary wanted better than Gail?
The lady let Gary play D&D with us on their freakin' wedding anniversary. She can do no wrong by me.![]()

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.