The new system and the old system. Constrained.

[Lerris]

Instead of a stamina bar you'll now have a mini clock ticking down to tell you when you can or can't do something. Personally, I don't see the difference.

The difference is the clock doesn't prevent you from doing every action. It only prevents you from doing the actions on a common cooldown timer ( which could be an individual ability or a related group of abilities ).