Moreover, if it's true that there will be more MP adjustments and we get slightly more MP or Fire IV reduced MP cost, 3.0 rotation will be even better.
Doing the 3.0 rotation Fire IV x2 - Fire I - Fire IV x2 when you are full MP leaves you with 2400 MP (MP cost of Fire IV). More MP or less MP cost from Fire IV would allow you to put an extra Fire IV. With 4.0 Rotation it would be impossible to fit an extra Fire IV without a Firestart proc.
