The Australian Araucanas are very similar to US Ameraucanas, with the addition of a crest, which is really cute! If you post pics of your chicks, maybe we can help sex them here. It will have to be mostly by color pattern if the combs aren't visible. I think the connection between pea combs and blue shells still holds true. Not linked, but the traits are usually inherited together.
This little one is 8 weeks old in this picture, any thoughts on what she is? The others are only 3 days old but I'll take photos in a few weeks.