Darkstalkers Resurrection will receive a new "Fight Request" feature via an April 12 patch, according to Shoryuken's translation of an update to the official Japanese website. Fight Requests, also found in Super Street Fighter 4 (among other games) allow players to queue up for online matches while practicing in offline modes, such as Arcade and Training.
The update also fixes various online matchmaking bugs, voice chat errors and in-game glitches, the full list of which can be found here, if you're into that sort of thing. For most people, however, the game will remain broadly unchanged.