As far as I'm aware there has been no news whatsoever on this front, with the exception of those who have publicly re-affirmed their commitment, or otherwise - for example, I follow a couple of Company cast members on social media who have posted throughout the pandemic about how excited they are to return. And on the other end of the spectrum, you have cases like with Karen Olivo, and Armie Hammer (not that I'm comparing these 2 in any way, except that they are both leaving their respective shows - for completely different reasons, obviously)
Personally, I'm most curious about Eliza Scanlen - she had joined the cast of Mockingbird, but she's become such a breakout film star over the past couple years that I wonder if she has conflicts / better offers. Not to mention she's Australian, though I don't know if she's based there. And unlike Hugh Jackman, Sarah Jessica Parker, etc. the production was never marketed heavily on her name.