Nikon Rumours has just posted this.
I'll take a pass, thanks. I have been a fan of Yongnuo speed lights ever since I became interested in off-camera flash. My reason has been that they were so cheap that even if they were duds, users weren't taking a huge hit to the pocket book. This is different. For some folks, $558 USD is a lot of money to spend on an unproven lens. We may as well spend extra for a lens that has already been proven. My 2 cents.