Actually, Apple have quite a few of 24/192 masters, (or lower, but higher than 16/44), as part of their Mastered for iTunes initiative, I think.
I could be wrong.
[doublepost=1488454289][/doublepost]More than commercial movement, I think this is a strategic and public image one . It is obvious that most people will not be interested, but it will stops critics that say their music is compressed, even if they are only criticism without weight.
It is the death sentence of Tidal, the only global service of uncompressed music that is usually news every X months for possible purchase by Apple.
And most important of all, it is an added and optional service. It does not harm any customer and offers the way to pay more for the music in Streaming. Even if it sounds crazy, there are people who would pay more for a service that does not make think that they are receiving less than when buying physical CD , even if it's a purely psychological issue.