Here's some links (From CSW) for two new rulebooks for the Central Front series. They are Consolidated and Unified and are there are two formats, A4 and Letter.
So what is the difference between the Consolidated Rules and Unified Rules?
The Consolidated Rules are an amalgamation of all the official sources of the first 3 games (Fifth Corps,Hof Gap & BAOR) made by SPI including the articles from Moves magazine. I have followed the guidelines set out in Filling the Gap by adding the BAOR special rules and optional rules into the rules so they are more integrated and easier to remember. You can consider these rules "official" and are meant to be used with the original counters.
The Unified Rules build on the Consolidated rules and adds the updated order of battle and suggested house & special rules from the Update Kit so that North German Plain and Donau Front can be played using the 2nd Edition rules(FP system). It also adds a bunch of rules from those games as optional rules. These rules are meant to used with the counters made by Kerry Anderson.