Quite a bit has changed from the first edition: map, country production charts, units, battleboards, and rules. Most of the miniatures are compatible with the second edition, but it is recommended that they get mounted on the counters. Because you bought the first edition, we will figure out an upgrade cost to get you what you need for the second edition. Will send an email and copy John.
thanks - and glad you enjoyed the first edition game for so many years!