Here is the download link for the "Age of Antiquity" workbook. It includes a Unit, Structure, and Technology tree in spreadsheet format. It is based largely on the original Age of Empires techtree, but heavily influenced by a newer approach. Each Technology has a detailed tooltip; just hover over the tech with your mouse.
Why are cavalry archer only available in the imperial age? BTW, the limited number of units in the Second age leads me to think that Fast Fortress will be a popular strat in this game.