I don't see them on the front page - they've been co-sponsors the last few years and I expect are still pulling the majority of the Sagamore, but are they dropping the sponsorship?
"Paizo is once again a co-sponsor of Gen Con 2016"
Gen Con needs to update their sponsor page it seems.
Paizo: “Gen Con gets bigger and better each year, and has become an annual homecoming for more than 60,000 gamers, and we’re thrilled to return to this must-attend event for game fans everywhere.”
Wizards of the Coast: “Meh.”