I may be jumping the gun a tad, but have a close reading of Sony's media release: "
In commemoration of the 50th anniversary of the release of Santana's memorable debut album "Santana" that was released overseas in 1969 and in
Japan in 1970..."
So maybe, just maybe, they're making a big deal of 50th (Japanese) anniversaries. If so, maybe there will indeed be further releases:
"Abraxas" was released as a LP quad mix in Japan in 1971, so 2021 would be the 50th. anniversary.
"Santana III", ditto, a quad LP in Japan in 1972, so 2022.
"Caravanserai", ditto, also a quad LP in Japan in 1972, so 2022.
etc.
I know the release of "Lotus" doesn't fit the logic, but I was rather suspicious that AF released the stereo SACD of it just before Sony released the quad. Go figure on that one - but personally I wouldn't have forked out money for the AF set in late 2016 if I knew the Sony complete 3 SACD quad set was released a few months later in April 2017.
Anyhow, as always, here's hoping there's something to this 50th. Anniversary logic (and us oldies are still around to hear it all).