Gryph
First Post
One thing I love with press releases like this are finding the small clues. Mearls specifically mentioned 'The Cathedral & the Bazaar' immediately after the GSL so that tells me that's a hint as to future plans.
link. There's more about the book which gives me hopeful feelings about the future of 4E Open Gaming.
The wikipedia article would seem to offer more support for WoTC doing more public beta testing (which they claim they are going to do) than sharing of the IP when the product goes to market.
I think it would be very difficult to place a value to WoTC of the network effects of the OGL. The value to the player base is fairly apparent, but how much Wizards realized in additional sales of their own products from the availability of 3PP products will always be a matter for debate.