Inner Fire's SP bonus in the latest beta build was cut down from 1350 to 531 at level 85.
Considering a raid-geared priest will have ~7000 SP at level 85, 500SP is not that much of a boost. I have a feeling this was done to make the choice between the main effects of Inner Fire and Inner Will more of a consideration; 531SP or 15% off your instant spell casts. The secondary effects (more armor or slightly increased movement) don't mean much for PvE, though they might for PvP.
Did Inner Will just become more of an appealing choice for you as a priest? Will you now consider "stance dancing" between the two? Or will you just pick one and stick with it, and which will it be?