The fact they have chosen such oddball titles across various genres and labels makes me hopeful for some more really great stuff...
If they want to follow up the RTF with more quad fusion titles there are some great options:
Mahavishnu Orch- Between Nothingness & Eternity Live
Weather Report- Tale Spinnin'
Herbie Hancock- Sextant, Secrets
Some other ideas off the top of my head...I tried to pick sort of weird or lesser known stuff that seems possible based on past releases. I apologize in advance for getting a little ahead of myself, but I bet there's at least one thing on this list people would buy:
The Guess Who- Road Food, #10, and Best Of Vol. II
BS&T- Mirror Image & New City two-fer
Chase- S/T & Pure Music two-fer
Dave Mason- S/T & It's Like You Never Left two-fer
David Essex- Rock On
Poco- Seven & Cantamos two-fer
Rick Derringer- All American Boy & Spring Fever two-fer
Later Santana titles not done by MoFi- Welcome, Borboletta, Amigos, etc (Though we'd probably end up seeing Love Devotion Surrender or the one with Buddy Miles first)
War- The World Is A Ghetto & Deliver The Word twofer
More Philly Int'l- MFSB, O'Jays, Isleys, etc
Anything on Project 3...but if I had to choose one then Tony Mottola & The Quad Guitars
More CTI- Airto's Fingers, Benson's Body Talk, Grover Washington Jr. Soul Box, etc
Jefferson Airplane/Starship- The Worst Of, Spitfire, Red Octopus, etc
Hot Tuna- America's Choice, Burgers, Yellow Fever
I'm just grateful for what we've gotten thus far...The PPL & RTF discs are my two favorites thus far. Thank you DV!