theBlackDragon;
The difference is presumably support for middleware between Mac and Linux. The main issues were middleware and people, so possibly key people may have quite or been sick for awhile during the Linux porting.
Possibly, it's kinda hard to judge from where we stand anyway, middleware is such a generic term it could mean almost anything.
I'm just glad it's still coming and I'm sure they Larian a thing or two about porting to Linux so future game ports will be smoother
