We have learned, from speaking with Hasbro staff briefly at Botcon 2014, that some versions of the Decepticon Stinger toy for the Age of Extinction toyline might be exclusive to Wal-Mart.
When asked following the Hasbro product reveal panel on Saturday about the lack of an appearance by Stinger in the presentation, we were told that:
"We've got some store exclusive releases lined up for Stinger with Wal-Mart, we should be able to show more at the Comic Con"
While it's not a concrete confirmation that the Generations AoE Stinger is going to Wal-Mart, it would explain why we've not seen a whole lot of him in advance retailer listings for the Age of Extinction Generations toys yet. Likewise it would also seem to explain why the Age of Extinction Power Battlers waves seen so far lack a Stinger.
Hopefully, we should have more information for you following the San Diego Comic Con.