We looked too, and to be honest we really couldn't tell one way or another. Sometimes it looked like four, others it looked like 4 because two toes were fused together.
They showed the feet SEVERAL times in that dock scene. I never had one frame where the feet weren't moving, so it was hard to get a still frame.
I'm going to say that its about a 75% chance IMO that they are 4-toed...but I can't confirm it unless I'm able to get a good pause on it.
Although they show their feet over and over again, it's always walking and they only show them for a little bit (because they know we are looking, probably). I haven't seen a shot of feet when they are all standing still. The fact that they shoot it that way (focusing on the feet, then not showing them for good shots) means to me that they are hiding something about their feet. Even in the walking shots, though I can't confirm/discredit whether they have only 4 toes...their feet do look weird (weirder than normal feet). Something's up down there....I'm looking for a screencap.