Improved Power Attack

Obsidian has confirmed that the improved power attack feat will be included in NWN2.

Improved Power attack
The details of this feat is not known at this time. Likely it will work as a more powerful version of the power attack feat, but it trades a higher damage bonus for a higher to-hit penalty.

It is not confirmed that this feat will be selectable as a bonus feat for a fighter in NWN 2.

NWN comparison

 * Improved power attack in NWN gave a fixed +10 bonus to-damage with a fixed -10 to-hit penalty.

Pre-release information

 * Power attack in NWN 2 gives a fixed +6 bonus to damage with a fixed -6 to hit penalty. Certain classes like the frenzied berserker enjoy a more favorable bonus to damage.

This was announced in the NWN 2 Forums