This Revised edition of the Technical Readout: 3050 was issued as part of the general FASA response to legal issues with the images of some of the 'Mechs detailed in the original Tech Readout and the original Technical Readout: 3025.
There are three major changes between the Revised edition and the original edition. Firstly, all of the 'Mechs with images that were tied up in the legal case were removed. Secondly, the chapters detailing Star League era technology and the technology of the Clans were removed; this information was generally available within the main rulebooks at this point. Thirdly, to replace some of the material removed, entries on the 'Mechs and vehicles introduced in the Technical Readout: 2750 were inserted.
With the various changes made, the Revised edition is some 16 pages shorter than the original edition.