The best thing about Miss Fortune getting a legendary skins is that they will update her base VO

Her not getting another skin after just getting one.

everyone in bilgewater/harrowing will be obvious interactions

maybe freljord champs

Lucian, Evelyn, GP, Illaoi, Tahm Kench, TF, Graves, Sivir, katarina, Swain, J4, karma, irelia

Basically she's a leader in bilgewater, so interactions with other leaders, anyone affiliated with bilgewater, other bounty hunters like sivir

I wonder why they didn't take the same opportunity when they gave Caitlyn her legendary skin. :/

I guess she might get interactions with mostly Bilgewater and Shadow Isles champions.

What's the precedent for this?

AFAIK, they've only ever done this for Lux when Elementalist was made.

Legendary skins that have come out since Elementalist Lux include:

God Fist Lee Sin Nightbringer Yasuo / Dawnbringer Riven Star Guardian Ahri PROJECT Vayne

None of which got any updated base VO that I'm aware of, most notably Ahri due to vastaya being a thing now.

She might make comments on her competition, as far as sluttiness goes