Looks like the June release isn't plausible.
In a recent update from the Tales of Crestoria social media channels (Twitter, Facebook), the release of Tales of Crestoria has just been postponed.
Cited reasons include trying to fix up errors seen in the game during the open beta done for Canada and Indonesia last month, as well as investigation of what remains to be taken care of for the game. In the meantime, the early June 2020 release seems unlikely. No concrete date has been given yet.
Stay tuned for more updates.