FR-reader Roger just told me that AmazonUS finally takes pre-orders here (XF 55-200). He said that “there appears to be no order activity yet as there is no sales rank posted. If this is correct, one could order now and be high on list.” UK-readers can preorder here at AmazonUK (“this item is due to be released on June 14, 2013“)
BHphoto estimates that the new Zeiss lenses will ship in 6-8 weeks. So they should be in stock in late June / beginning of July.