An interview with him has just been published which provides a great summary of his ideas:
Researchers followed volunteers for twenty years, and found that the amount of butter they ate had no relation to their risk of having a heart attack. On the other hand, people who ate the most margarine had nearly twice the risk of having a heart attack as people who ate none. Saturated fat is a red herring that has been overemphasized largely for historical reasons. One fat that is clearly important is omega-3. It's found mostly in seafood, flax, green vegetables, and fats from pasture-raised animals. It's critical to have a regular source of omega-3 in the diet.