From the back cover:
In 3049, the first Clan forces appeared in the Inner Sphere. Armed with advanced technologies of a long-dead age, the warlike invaders unleashed a devastating blitzkrieg, capturing world after world until a total Clan victory seemed certain. Unable to match the enemy's superior 'Mechs, the Inner Sphere militaries increasingly turned to their combat fleets for relief, only to find the skies filled with deadly Clan DropShips, JumpShips, and WarShips - massive vessels not seen in the Inner Sphere for hundreds of years. Now the Great Houses have begun to rebuild their own armadas and stand ready to challenge the Clan invaders in the infinite battlefield of space.
This revised edition of the original Technical Readout: 3057 contains descriptions, illustrations, and full Aerotech 2 statistics for the Inner Sphere and Clan DropShips, JumpShips, WarShips, small craft, and space stations common in 3057. Additionally, this volume contains twenty-four WarShips mentioned in the fictional context of the BattleTech universe but never before presented in a technical readout.
This FanPro produced edition, specifically annotated as the Revised edition, attempted to bring all of the Warship, JumpShip and DropShip entries up to date with the latest AeroTech 2 rules.
This edition reprinted the majority of the material from the original Technical Readout: 3057, but removed the chapters on light, Medium and Heavy AeroFighters and OmniFighters. To replace these 30 or so pages, new entries introduced 25 new WarShip designs - or, more accurately, "lost" WarShip designs. The new ships introduced represent older WarShips, most of which were introduced well before the Star League era, and includes such designs as the Lola I and Lola II.