According to the leaked FAQ for the 2.0 draft, they're still trying to
make it impossible to use it past a certain point which isn't keeping consistent with their own FAQ that said creators could continue to use whichever license they like. WotC's statement doesn't exactly contradict the 2.0 FAQ leak either, it says "Content already released under 1.0a will also remain unaffected" which doesn't mean people can continue to use OGL1.0a without threat of legal action going forward. How legit is that leaked info? I don't know, but considering WotC flat out lied in their statement about 1.1 just being a draft when it was attached to contracts for 3rd parties to sign I'm inclined to remain cautious of their position until the release something official.