There were several Sony 5.1 SACDs that sat on their release schedule toward the end of their SACD program that never came out (bmoura could probably definitively say if there were more, because he used to run a website that listed them) but from my memory they included the following:
Byrds - Fifth Dimension
Stevie Ray Vaughan - Couldn't Stand The Weather
Sly & The Family Stone - Live At The Fillmore (when it was still going to be a single disc release)
Herbie Hancock - Future Shock
Maybe not quite as exciting as the abandoned Warner 5.1 DVD-A's but still definitely worthy of release nonetheless.
Byrds - Fifth Dimension
Stevie Ray Vaughan - Couldn't Stand The Weather
Sly & The Family Stone - Live At The Fillmore (when it was still going to be a single disc release)
Herbie Hancock - Future Shock
Maybe not quite as exciting as the abandoned Warner 5.1 DVD-A's but still definitely worthy of release nonetheless.