Yeah, it's most of the regular Santana lineup as well as the Isley Brothers. The basic tracks were recorded back in the fall of 2015. Cindy, Benny, Tommy, Karl and David Mathews were all onhand. Paoli reportedly wasn't there, so he may have come in for overdubs or Karl may have laid down the conga parts. Bill and Jeff were still in the band at the time but I didn't hear anything about them being involved. Andy sings on at least one track ("Higher Ground.") Don't know if Ray Greene will be making any appearances or Tony for that matter. Cindy reportedly sings as well.
The only "special guests" I am aware of are Eddie Levert and Greg Phillinganes. They were both involved in the original recording sessions. But they could have brought any number of people in for overdubs.