Listed for Vita and PS4 in Japan, "Hacker's Memory" is likely just a glorified expansion pack, with another hapless victim sucked into cyber space, with a host of new Digimon to play with. Given Cyber Sleuth (review), was very popular in the west by Vita standards, hopefully we'll get a digital release, unless Bandai are still being complete dicks.
UPDATE: Apparently, there's an EU trademark kicking around, so the game is likely coming, but I'm sure Bandai will manage to annoy Vita owners somehow.
UPDATE: The JP Site update is now live with our scary-eyed hero on the front page and a 2017 release time frame.
UPDATE: Western release confirmed for early 2018, there you go, a big name game for the Vita's sixth anniversary(ish).
In Japan, they are shipping the original game with this update, making a neat high-profit bundle.