In general my players, most of whom are newly introduced to AM, are most excited about the House books -- these books, they feel, will give them better background material on how to fit into their Houses. They are eating True Lineages up and are excited about Mystery Houses -- though they were also very, very confused about the differences between The Mysteries (Revised) and Mystery Houses. At the moment (though I am absolutely sure this will change upon publication!) they are not interested in non-Hermetic mysteries, only the Houses. They are also worried that the mechanics for how to advance in a Mystery House will be in The Mysteries (Revised); the players all want to pick up the supplement that contains "their" House, and thus a few of them are worried that they will have to pick up two books. I told them I do not know, but assured them that I would be picking up both books, so they should be set.
As to the Realms books, the group is most intersted in the Magic version. They are interested in RoP: Divine, but to a rather limited extent. The Infernal and Faerie books they are more looking upon as "monster manuals", while Magic would, once again, feed directly into what they are doing is players. This and they are all speculating as to what the "origin point" for the Magic realm is, the equivalent of Heaven, Hell, and Arcadia.
Covenants has gotten decidedly mixed reviews in my group. I am beginning to believe this book is the "White Album" of supplements -- everyone agrees there is brilliant material in here and some, to be kind, highly questionable material, but my players disagree amongst themselves as to which are which. For the most part, however, they view this as a "GM's Book", not a "Player Book". This may change with time, but at the moment that is how it is seen.
So, just a view from one group of 6 players + storyguide.