Patch 1.1:
The cooldown indicator on hotbars no longer causes all ability icons to appear grayed out (unusable). Now, when an ability is on cooldown, it will not be grayed out if its activation conditions (like resource costs or range) are met.
This is horrible, its hard to tell when an ability goes off cool-down especially as it gets closer to being available.
From talking to lots of people in my guild, other guilds and general chat most of them hate this change as it now makes it hard to tell when an ability is off cool-down.