Tier Resurfacing is a new display feature being rolled out in Empires & Allies. This feature doesn't involve any change in the combat mechanics of the game. It's just labeling combat units (yellow stars in image) according to their Tiers, which have existed as long as E&A itself.
Long-time readers of this blog will already know the following:
"Higher Tiers do more damage! Look for Unit Tiers in the yellow star. Unit strength isn't all that matters in combat!"
