Probably locked up in legal wordings for some reason.
Or they want their product out first before the competition storms in.
Or a new mold has appeared that seriously dampens the business-sense of people in the Pacific Northwest...
Or greed. Seriously, it's about money. Big Hasbro money. Unless someone can prove they will make record profits by making 5e OGL, it's not going to happen. The GSL debacle is proof. Hasbro will ooze in, fire/kill/destroy any idealists, and ooze away with all known copies of any OGL...
I may be wrong, which would be fantastic for those who want to make products for DD5e. Don't hold your breath.
Also, who cares? Look at the avalanche of great OSR and OSR-like stuff coming out. Most of them are compatible with each other, easy to hack/customize, and by my readings, dripping with creativity. You can't bury the OGL now, it has a life of its own! You can play any edition of D&D you like, with oodles of suggestions for house-rules (various OSR clones), and it keeps on coming.
Personally, I would like to see Hasbro license D&D to a core group of real enthusiasts or take a long break. Keep the previous editions in print (including 4e) and then fuck off for the love of the hobby. For Gygax's sake we have ENWorld and theRPGsite, we don't even need an official site!
It seems we're getting stuff that's more creative and fun to play anyhoos. Paizo has the 3.x market (competently and beautifully) in hand. We don't need a new D&D. It's reached the "who cares" point. 5e will be stillborn. I can't imagine anyone noticing when it happens.
Is anyone really waiting on baited breath for this edition? It just seems like an expensive non-event to me.