Romancing SaGa 2 will launch in the west for PS Vita and “some other game consoles” in December, series creator Akitoshi Kawazu said in a tweet.
The western version of Romancing SaGa 2 first launched for iOS and Android back in May 2016. Plans to release the PS Vita version in the west were also announced that month.
What the other platforms are is unknown but there's a chance it could be on either the PS4 or Switch. I'm personally hoping it comes to Steam since SE has been releasing all late ports on PC of course :p.