Why The EF 200-400 f/4L IS 1.4x Delay?

Link: Why The EF 200-400 f/4L IS 1.4x Delay? « Canon Rumors

We’ve been banging on the proverbial doors trying to find out why the known EF 200-400 f/4L IS 1.4x has yet to be officially announced, priced (it’s going to be $10,000+) and made available to the  people that need it.