I was rather hoping to see warlocks in Pathfinder. They are one of my favorite classes. I was even know for my warlocks.
I don't know how many people actually used warlocks, but I found they can be rather versatile if you did them right. It would depend on feat, invocation, and possibly prestige class choices. that sounds like a lot but if you an idea of what you want to do it all falls together rather easily.
I'm just kind of hoping that this thread will prompt the designers to consider the warlocks inclusion. Particularly if other read this and add to it. Here's to hoping.