Luna Online Launching on Steam on October 6th
Yet another older MMORPG is launching on Steam; this time it's the cute anime inspired Luna Online from Suba Games, which is launching on Steam on October 6th, 2017 as "Luna Online: Reborn". The game features 4 playable classes with a unique skill system that allows players to mix and match various skills and abilities.
Given that the game originally launched in 2009 and was never particularly popular, I don't think a Steam launch is going to give it a huge influx of players, but it will surely get some kind of boost. It is however, quite convenient for the game's current players. I expect the trend of older MMORPGs launching on Steam to continue as it's a cheap and easy way to reach new users.