Rough production schedule? Casting news? In-universe timeline? Basic story themes? For me, it's who's scoring. I know this is probably not the next thing we'll actually find out (score doesn't need to begin work until next year), but finding out will actually complete my idea of what to expect in terms of continuity with the previous films. JW is getting on in years, and I realize that with JJ on board, Giacchino is a likely favorite. I think if it's not Williams, however, there will be a certain lack of familiarity in the music, no matter how Williams-like the composer may be and how many of and how often he/she uses previous themes.