The Heavy Gear Blitz! Field Manual - Core Rulebook Revised is exactly what it says in the tin. Stripped of setting fluff, the pdf presents an updated set of rules for use with all current and upcoming Heavy Gear Blitz products.
The PDF is clear and easy to read, but does lack bookmarks, something that would improve the usability of the product. That said, the rules themselves are presented very clearly, and the addition of flowcharts to handle some of the more involved mechanics is very helpful, especially to players who are still getting into the Heavy Gear tabletop hobby.
Those who are looking to pick this up should be made aware however that while the book has all the rules, it doesn't contain the army lists. For those, you'll have to pick up Locked and Loaded, or any of the other Army Books.
[4 of 5 Stars!]