I know about the Gods of Ancient Rome... Anyway, here are some other indications besides the starling screenshot and what I also pointed out.
A) Nintendo and Intelligent System is pushing her hard. She is going to have two routes compared to Dimitri and Claude that only have one
B) The team song is literally about her
https://www.youtube.com/watch?v=3u-6_T_ZxL8&ab_channel=MasterEnex and named after her (its called Young Lady of Hresvelg )
https://nintendosoup.com/fire-emble...-theme-song-is-called-young-lady-of-hresvelg/
C) A big deal of the game is the crest of the gods (going back to the Gods of ancient Rome)
The Mii Sword Fighter and Duck Hunt Duo is said to be the beta models for Banjo & Kazooie and Hero sort of like how ZSS was the beta for Bayonetta. Why do I mention that? Well. go back to the supposed Jane character that was together with Joker that we saw nothing about. Who isn¨t to say that Joker is a beta for someone else.. and I could easily see him being so for Edelgard judging by the terms of character she is in looks and attacks of what has been seen in the trailer. She also has hair that contains ponytails to an extent.
So again... I agree with y'all that it certainly looks in Geno's favor (even though I¨m skeptic due to spirit and fighter icon) and I sure as hedge hope it's him. I also don¨t want her in because of so many FE characters.. But all things considered, I would not count her out, unfortunately.