Scale has been a constant question, and thorn in the side since Legions announcement. What might be an interesting move is if FFG release just a rules pack as they did with Rune Wars, got the cards needed, got the rules, can buy the dice separately anyway, so those playing IA can buy into Legion without needing to replace minis, unless they want to of course. Even those wanting 15mil scale could adapt the system.
For the fans of Legion who are of course dominating this forum, don't shoot the messenger here, the fact is there has been official star wars wargaming for the last 25 years since West End Games released there ruleset. Check the facebook page its still got its fans playing it now. So some Star Wars Wargamers in some instances have spent decades, including the Collectable miniatures game from more than 10 years ago building up there collection. There not about to bin that overnight because another ruleset is on the market.
A Runewars style rules and cards only set could serve as a low cost entry to the game that could bring players over, or at least have players buying into the game who could play there m8s who have got the Legion figures.
I think that's a win-win for everybody.

Just had to add this to my post: