This news is a few weeks old already, but Paizo plans to keep supporting 3.5E for a while according to the Pathfinder
news page. Since WOTC won't be printing new 3.5 core books once 4.0 is out, Paizo also plans to release "Pathfinder RPG", which is essentially a core rule book with 3.5 rules. There will, of course, be 4E conversion guides/materials, so we will hopefully get the best of both worlds.
Cross-posted in dnd3e