JTA Facebook reader Kyle O. has informed us that he reached out to Hasbro UK and they confirmed that the UK will indeed be seeing The Black Series 3.75" Walmart exclusives at ASDA. Now, we aren't able to confirm this beyond the message he relayed to us, but hopefully this will be announced in some official capacity by Hasbro UK in the near future.
UPDATE: Our friends at Jedi News reported this news yesterday and it is officially confirmed.