Eminent

I'm aware of the fact that this probably is a stupid question, but I'm wondering whether or not, your Prometheus engine is homemade? I'm wondering about this, due to the fact that Prometheus also is the name of Gamebryo's engine. Other than that am I wondering how you plan to beta 0 A.D. I'm not interested in a date, but rather your methods, if you want to share them that is.