I saw it in the patch readme but don't know what the goals are. Also, I put in the casus belli event code to get a conquest casus belli against the Ottoman Empire, thinking that that would open up reforming Byzantium, but the casus belli didn't appear on the list of options when I declared war. Is there a reason why?
Blog: http://theuderikhos.wordpress.com/ They should build a mosque in mecca. Right next to the dome of the rock. -- Lord Sideous
You need to get all of the Greek cores from the beginning (think modern Greece), plus the cores from the Megali Idea (Bursa, Izmir, and Thrace), and the Konya/Iconium region. After that the decision to form Byzantium should appear.