Because Verizon didn't release it yet. The reason is probably considered a trade secret, so if anyone who actually knows why tells you, s/he can hope that the worst that happens is a pink slip. (Revealing a trade secret is actionable, takes tons of money to defend against, and if Verizon can prove, within reason, that it lost a certain amount of money, or expects to, as a result of that information having been released, the person releasing it is going to be paying off the judgement for the next 5,000 years.)
I would hope that the reason is that Verizon doesn't want to have to deal with the bug complaints if it releases it. I know that's like hoping for a valid million dollar check in tomorrow's mail, but it would be nice.