Might need a few more weeks to say for sure, but I'd guess cockerel. The comb is already looking pretty well developed, and while not red, it is pretty large for that age. It has more of a comb now than my 12 week old lavender araucana (both sadly tailed and cleanfaced too) pullets.
hdowden asked for a pic in another 3 weeks or so. It's another 4 1/2, so the Araucana is 8 weeks old.
I was really thinking roo, but as it grows, I'm less sure. What do you think now that it's a bit older?