Christine wants to rejoin the band according to The Guardian

[Johnny Stew]

I think they'll record together before touring. Just seems like there've been a lot of signs that they'd lean in that direction. I also think, considering John's health, recording an album would afford him more time to fully recuperate after chemo & all of its side-effects (which my brother is experiencing right now).

Probably the least time-consuming and economical choice, would be to "open up" the mixes on Lindsey's remaining five songs, so that Christine can add keyboards and she & Stevie can add backing vocals (much as they did with the original 'Gift of Screws' songs that were folded into 'Say You Will'), as opposed to starting completely from scratch.

From there, they can focus on recording Chris & Stevie's tracks -- which might not take too terribly long, depending on how fully realized the demos are.

If it all comes to fruition, there's certainly a lot to be excited about.