A vorpal type sword, possibly based on katana, this would have true strike and increased crit range automatically applied on equipping weapon as long as it was used with its companion blade wakizashi. This would last as long as the true strike spell and the weapons would have to be re equipped before being able to be used again. Equipping both would give the two weapon defence line of feats as well.
A mirror shield. This would have a percentage chance of reflecting spell attacks.
The dwarven defender shield I think should have damage reflection similar to the hooded creature line, it would make them worth playing as frontline meat shield.
A weapon range with a radial change material type attached, that you could use to bypass immunities (cycles through cold iron/alchem silver etc)
A shield with knock down ability, used like a shield bash.
Cross bows with the elemental archers hail of arrows feat, on a cooldown timer.
A flail with the phantom warrior spell ( as we haven't got whips that could pull enemies to us
) this could be a uses per day or cooldown.
Just chucked a few ideas in on some of the lesser used weapons to maybe create some new build types.