The companion book for Love and Rockets is coming soon in August 2013.
It's going to be 240 pages and features in-depth interviews with creators Gilbert, Jaime and Mario Hernandez. There will be character family trees and glossary, timelines, the Hernandez Brothers bibliography of all things drawn over the 30 years.
The Love and Rockets Companion: 30 Years (and Counting) is available for pre-order at Amazon (US | CA | UK | DE | FR | IT | ES | JP | CN) and Book Depository