they barely had enough to fill an 8-song album for Black and Blue. 'Worried about you' and the backing track for 'Slave' come from those sessions. Doubt there's much else thats usable. 'Built that way' from those 'Fully Finished Outtakes' that came out a while back comes from then, however, and they've obviously considered doing something with that
I think they basically cleared up the loose ends from the 70's albums on the bonus tracks on last year's Tattoo You deluxe as most of those songs were never under consideration for that record. From the IORR sessions, they used 'Drift Away' (left off the album as presumably they thought releasing one cover, the superior 'Ain't Too Proud To Beg' was sufficient), 'Fast Talking Slow Walking' and 'Living In The Heart of Love' - all of which have been in circulation for decades. I don't think theres much else.
'Scarlet' was recorded after IORR came out and before the Black and Blue sessions started, yet they used it on the GHS reissue
- so I think they've dug as deep into the vaults from that 1973 - 75 era as they can.
the only album left that from that era that they could really revisit is 'Emotional Rescue'. Its far from a classic Stones album but if the circulating material from those sessions are any guide, its a record that could benefit from a reappraisal.
I still hold out hope that they can come to some agreement with ABKCO and put together a multi disc release of the 1968-69 sessions but I'll probably be 85 and deaf in both ears by the time that happens