Brightline usually throws out they're "exploring" new corridors for expanding such as Atlanta-Charlotte, Northeast Corridor, etc. Recently though, they've expressed interest in a Dallas-Austin-San Antonio-Houston route, which I don't believe they've expressed interest before. If Brightline is serious about expansion and Texas Central is struggling to finance capital, a possibility could be Brightline taking over like they did with DesertXpress.
https://www.railwayage.com/passenger...-into-orlando/