I had this on the official Paizo forums, but apparently no one wants to touch it. Didn't think the class was that detestable.

I've always wanted to play a Hexblade since I saw what it was capable of for Medusas, but now that Pathfinder's out, our group's going to be switching to the new book, and I won't be able to play it. However, with the way things are, I figure it shouldn't be that hard to convert. Just be a matter of it getting accepted by the DM.

Changes:
Spells per day ala the Ranger/Paladin (4/4/3/3), and at CL-3.
I'm a little leary of doing this, but upgrade to d12 HD from d10. Everything else went up by 1 progression, so why not? Or, they could have 4+INT skills. That'd balance things out too.
At 4th level, Dark Bond (choose familiar at full sorcerer level instead of -3, or dark companion at 3/4 level instead of 1/4).
At 6th, 8th, 11th, 14th, and 18th something should be placed in there to have no empty levels. Maybe more bonus feats, or an additional curse or aura of unluck per day.
Their spells known could probably go up an increment as well.
What would you guys do to upgrade this class to the new system?