Yeah, one of the reasons why I think we will be getting Ash, Fujin, and Sheeva isn't just the fact that they were in the files, or that it seems Ash was in the original KP1 line-up, it's that a lot of their dialogue seems to be done. If I remember right, Fujin had a TON of dialogue in the files, maybe just as much Nightwolf. I can see them doing some lines before they know he will be made or not, but to put so many subtitles in the game before it's actually a go doesn't really make much sense.
That, and I think we could be getting Season 2 because maybe NRS can't release a game every two years anymore. Characters are taking longer to make than before, the game had some problems at release probably because they had to rush, and NRS was called out for extreme crunches and work conditions. There are probably some studio changes happening/coming up. That along with the transition to next gen consoles, NRS might need more time for their next game.
So NRS might have an opportunity to keep working on MK11 on the side instead of dropping it a year into the game's lifecycle like they usually would. This is all speculation, of course.
EDIT: Spelling.