They stopped development on their new game "3333" because the game engine they were working with, ACTION MV, was too clunky for the scale of the game they were making. So now they're developing "KITSUNE Defense" instead so that they can at least put a game out while they wait for the new ACTION engine to release, which they hope can handle their vision for "3333".
As of May 31st, they're pretty much finished with "KITSUNE Defense", but they said they were delaying the release of its trial version because they want to polish the game up. They didn't say for how long but judging by their original plan to release the trial version on May 31st and full version at the end of July, it's likely that the trial is now going to be released July 31st if they don't just drop the full game at that point.
As a bonus apology for the delay of "3333", they plan to implement 3,000 JPY tier supporters' OCs into the game when it picks up development.