Chinese seller flyqiong87 has listed this very interesting set of 3.75 inch Marvel figures today.
The seller is well established for selling a number of Hasbro and other properties at reduced prices - most likely factory seconds or similar.
The set has since been removed from sale - although the listing still exists at time of posting.
The set contains Howard the Duck, The Collector, Lockjaw, Cosmo the Spacedog and Moon Boy - a reasonably obscure set of choices, but perhaps perfect for a limited SDCC release - which is now the common train of thought as to where this set will turn up. We await further (official) details.