If you look at the latest pics, you'll see some really dark, shiny red coming in on the wings and on the back right in front of the tail. The feathers on the back, in front of the tail are called saddle feathers and only roosters will have those. Roosters will typically have much flashier coloring and not necessarily as even in their coloring as a hen. He also has a very large, well developed comb and thick legs/big feet. His neck feathers (hackles) are starting to look pointy as well.