0 A.D: Empires Besieged - it will be a new chapter of 0 A.D?
P. S.
Since I have never been a developer and this is none of my business, nevertheless I would like to suggest you to swap the words in the name of the game before the project leaves alpha testing. How about to make "Empire Assedant" main title and 0 A.D. secondary? Just like Anno series: Anno 1404, Anno 1701. It could sound like Empire Assedant: 0 A.D., Empire Assedant: 500 A.D. or Empire Assedant: Ab urbe condita? I think Empire Ascedant is more universal name just like Age of Empires 1/2/3/4 and it will be the best for starting your recognizable franchise line.