Since its first reveal at Nintendo's Switch presentation in January, ARMS has yet to be given an official release date. Stated only as Spring 2017, nothing more concrete has been announced from Nintendo to date. Now Amazon Spain has listed the extendable arm fighting game for release on June 23rd; check out the translated screenshot from the page below:
This isn't the first time Amazon has supposedly given away the launch date for ARMS. Previously the retailer listed the game for release on 2nd May, however many assumed this was a placeholder date. In the meantime it's best to take this news with a pinch of salt until we actually get an official announcement from Nintendo.
Earlier this week Nintendo gave us a character introduction trailer giving us a glimpse of the fighters available in ARMS, so it's evidently continuing to gear up promotion for the release.