As many fans of WH40K, I was looking recently through the range of new Space Marines miniatures, especially interrogating all photographs of the plastic sprues. To my surprise, all of them are dated 2012 (see photo below)! This means more than 9 months between final acceptance and the release. Taking into account that first leaks appeared no more than one month ago (during White Dwarf printing, I bet), this shows how serious (and effective) the company is about keeping their secrets, despite efforts of some bloggers to publish rumors early.
I wonder, what they have in the office desks already (beside the tyranids, of course)!