I believe that Joe stated that a compilation of Frostgrave and the various supplements will be released in the future, but I'd really like to have an abridged version, minus the fluff and the pictures. The current Frostgrave book is 137 pages (PDF version), but it could easily be condensed to far fewer pages. I'd also like to see things like the spell charts, item charts, soldier options, etc., consolidated together so that we don't have to reference different books or sections.
As an example, the current rules to create a wizard, which includes school specific information, is ten pages. that could easily be condensed to probably two pages, with only hard data being present. Just have the wizard stat line, weapon options, the rules for spell selection, and a chart showing opposed schools, etc.
Then have all of the spells (arranged by school would be better, I think), including the supplement spells.
Have all of the soldiers in one location.
Have all of the basic combat rules, minus situational explanations, etc.
Have all of the item charts, monster generation charts, etc.
All of the rules, focusing on the hard data, could probably be condensed to about fifty pages. This would be great, since it would be much easier to reference rules mid-game. Obviously, this would be more of an optional supplement, but it would be great.