I thought the HC was being released at the same time as the comic editions. But, today the HC moved to Aug. 02 on the Diamond site so I guess maybe it is being released later.
On a related note, when IDW sent me all the cover images for TMNT/Usagi yesterday, there was only one image for the HC (the Regular cover). When I inquired about the Sakai Signature Variant version, they told me they didn't see it so weren't sure about its existence. Maybe Stan is doing this one on his own?
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