The leg color on every Wyandotte should be yellow-it's breed related, though as hens lay more and more eggs, the leg color tends to fade, then comes back somewhat when they take a break from laying.
So it's 16 weeks now? I would be expecting to see the longer skinny feathers on neck and back near tail and a rooster tail forming by this age. Is there any sign of new feathers coming in?
Mine had a definate roosters upright stance by then too.