One of my most very awaited book these days certainly is the forthcoming Solaris Internals, 2nd Edition -- note: The Complete FreeBSD is one from my previous hot list ;). The content cover an incredible list of various topics, especially updated with the new Solaris 10 and OpenSolaris features, such as:
Interestingly, this one will finally be available on two separated but complementary books.
From this point, please follow these interesting blog entries from two of the original book writers:
Can't wait for these to be available, really!