Five current AB are off contract at the end of the year: Ardie, DMac, Weber, Cane & Taylor. JBar is contracted to NZR to 2023 but his 'canes contract also runs out this year. Don't think it really matters if he stays at 'canes or moves to Loss Bleus, really.
You'd like to think the Captain will re-sign (but also wonder why you wouldn't "suggest" he do so before making him captain) so imo the guy they really need to get signed asap is Taylor: not sure Coles will last to RWC & other than Aumua & Eklund there don't seem too many Test-ready options out there.
The guy we might well lose is Weber as (a) they've re-signed Perenara & (b) there's a number of good young 9's coming through incl obviously Fakatawa but also Roe & Roigard plus older guys like Hall & Drummond. I think we're gunna lose Weber, which will be sad.
DMac would be a huge loss to Tribe but AB not so much imo, I'm really not that fussed if he re-signs or not. I'd be sorry to see Ardie go, too, but again there's enough young & mid-career guys to replace him so losing him wouldn't be that big of a problem imo.
Goes without saying they need to get Razor locked in before someone starts waving a big chequebook at him.