EF 200-400mm f/4L 1.4x to be announced this month ?

Canon EF 200-400mm f/4L IS USM Extender 1.4x

Recenet rumors from CR that the long waited Canon EF 200-400mm f/4L IS USM Extender 1.4x is to be announced soon.

It is rumored to be announced on May 14, 2013, this Tuesday. Another date is on May 31, 2013 as rumored before.

It is also told that limited quality of this lens will in stock 3 weeks after the announcement.

via: CR