I believe their is a new rule where if Japan attacks before turn 4 US gets 30 IPC’s immediately. This helps a ton to balance out the map.
Photo Comparison of UK units in AAPacific and AAPacific 1940
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The UK BB’s are different sized as are the USA BB’s.
The 1940 versions are noticeably, but only slightly larger.
The Japanese BB’s are the same sized.
Look at this photo:
http://www.boardgamegeek.com/image/625641/axis-allies-pacific-1940-edition
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Nice comparison picture.
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Yes, this is really cool. Thanks for digging it up and posting it.