Australia
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Athletics Complex (Colosseum --> Stadium)
(its only bonus was to never obsolete,so it needed something)
+0.33 :) per citizen (0.25 for Stadium, 0.33 Zero-G Sports Arena)

Light Horse (Cavalry)
reduce withdraw chance to 10% from 30%
upgrades to Early Tank (instead of Light Tank)
remove +50% attack vs. Cannon
remove +50% vs Animals

Austria
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Grenzer (Rifleman)
cost down to 200 from 230
strength down to 25 from 26

Baktria
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(I see nothing to change)

Bangladesh
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Kabaddi (Colosseum --> Arena)
remove -20% maintainance
add free Combat I

Batavii
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Alae Miliaria (Horse Archer)
update stats to Horse Archer

Belgium
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(I see nothing to change)