From the White Wolf site:
Manifestations of Ichor is a collection of new rules for Scion players. Included are rules on how to make a demigod or God at character creation, 27 new Knacks (three for each Epic Attribute), 15 new Birthrights (three Creatures, three Followers, three Guides and six Relics), a complete pantheon Purview (Scire) and Virtues for the Atlantean pantheon first detailed in Scion: Demigod, 32 new All-Purpose Purview Boons (two for each Purview) and 10 new Magic spells.
The Scion Companion is a joint venture between our traditional and alternative publishing divisions, to provide you periodical content for Scion without leaving behind fans to love our hardcover books. The first four sections will be released as individual PDFs over the course of the next several months. The final two sections of the book (a third pantheon and a new background for Scion cycles) will appear in the final release of the Scion Companion, which will be for sale online and in stores as a hardcover book, as well as a complete PDF release combining all of the sections.