Seeing as though it was Gilmour's wife who originally announced it i'm assuming Waters is not involved.
Apparently theres some leftover material from Rick Wright so presumably Gilmour and Mason will get together and Gilmour will get with missus to write his lyrics for him again!
I'd have been cynical if they'd have got Waters back in the band tbh let alone this but its just my opinion I guess. Pink Floyd needs Gilmour/Waters/Mason/Wright for me. Wasnt a Syd Barrett fan TBH.