The mobile version will take place 1000 years before the current story in the PC version. There is currently no further information regarding launch dates or release outside of Korea. Like Lineage 2 Revolution where Netmarble licensed the IP from NCSoft, they will be licensing the IP from Bluehole.As I mentioned before, Bluehole Ginno tried to bridge the lack of an actual TERA based mobile game by utilizing characters based on TERA races (with the Elin being the hallmark) in Devilian Mobile.
With an actual mobile version of TERA now on the drawing board and Bluehole making a decisive decision to outsource the actual development to Netmarble, their Ginno subsidiary (which again refocused primarily to mobile development) has nothing else to fall back on since the whole “Devilian IP” thing has not been a huge selling point (and graphics wise when it comes to character classes, the larger majority of it is based on TERA IP).