The draft in general could be really interesting next year. Very strong chance that Malan, Buttler and Sam Curran will lose their main central contracts, given that none are currently in the test side.
Potentially (but much less likely) Archer, Woakes and/or Mark Wood as well, due to their injury issues - but I'd be very surprised. It'll likely just be the above three (plus Burns).
These are all players who didn't need to be drafted this year, and so haven't cost their sides a single penny. But without a central contract next year, they would need to take up a salaried squad place in order to be retained. And arguably every one of them could justify demanding a top salary slot - which their current side either might not be available offer, or might have to release another big game in order to accommodate them.