Among other interesting stuff, Keith mentions something that are more interesting than others
"RC: Is there much in the ELP archives?And there are more.
KE: I've got loads. I've come across some really interesting bootlegs like the concert with orchestra, and wow! Trilogy in Germany. We didn't play it for very long as it was too demanding for Greg!"
"RC: Do you have any unissued pre-ELP tapes?
KE: Yeah, in the vaults of Sanctuary, now Universal. They're transferring tapes of jams we did. I remember when we were in Compass Point Studios for two months - and you can imagine how much that cost us".
Hopefully the lead time between interviews with Keith in RC and the actual release of the material will decrease significantly.
Though I doubt it will ever take less than a year.