Anyone know the formula for Spirit regen?

[russ]

This makes sense.  For a while I had twice as much mana as health and the bars moved at the same speed.  Does the formula change when you're in Cat or Bear?  On one hand you'd think it would, but since you still gain mana in forms I'm not so sure.
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Nope, regen stays the same, which is fairly interesting of a design decision.