Should be next week. He got released the 14th of februari. (allongside with Sion and Visas).
I'm expecting marauder to get an relatively easy farming location. Personally i'm more curious to see where Sion gets placed though.
They said marquee characters would go to shipments/chronium packs within 4-6 weeks and then to cantina/hard battles after a further 4-6 weeks so Leef is right Sion/Marauder etc should be placed in the next week or so.
Here is a list of new farmable characters:
... 9th May 2018:
Cantina Battles:
[Position]: [Character] replaced by Darth Sion
Light Side Battles:
Hard [Position]: [Character] replaced by Visas Marr
Dark Side Battles:
Hard [Position]: [Character] replaced by Sith Marauder
There will be the chance that Darth Sion will not be farmable in Cantina Battles instead in Guild (Event) Store or in another store like Jawa Engineer, Jyn Erso and Echo.
Replies
I'm expecting marauder to get an relatively easy farming location. Personally i'm more curious to see where Sion gets placed though.
https://forums.galaxy-of-heroes.starwars.ea.com/discussion/164529/ideas-for-characters-and-ships
where Darth Sion, Sith Marauder and Visas Marr could be farmable in which locations.
Those locations are pure speculation, maybe that's worth mentioning before others take it as fact.