This is the 4th Edition with vastly improved contents over previously released versions. There are many differences, over the others, that have been enhanced from these fine folk's efforts and countless others.
The best way to see those, is to visit the L2 Design Group's web-site or one of the other's that feature this wonderful game. Some of the things that they've done for this is: enlarged the size of the game-board hexes; enlarged the game counters(to 5/8"); enhanced the visual aspects of the graphics; included New Scenarios; allowed for an 'Allied Expeditionary Force'(Variant Counters); provided a New Weather Chart; improved on everything in general; and even included a CD-Rom for gameplay with others over the 'Net!
There should be no shortage of opponents for those dedicated to supreme Wargame play with this and it's definitely worth the effort and for the value you will benefit from acquiring a copy of it. Those folks at L2 D.G. are planning on releasing even MORE of John Edwards' great games designs and I'll be looking forward to their expertise in producing them as well. Then maybe, the rest of you folks can reap the pleasure of J.E.'s innovative systems & improvements over his competitors from his earlier releases as well as I have.