Mantic gives you a look at the Basilean Force List in their latest update.
From the update:
The Basileans are Mantic’s first human army. Full rules for using them in games of Kings of War will be in the upcoming supplement The Basilean Legacy, which also contains all their background and detailed information about the great nation that they call home.
For anyone who wants to try them out, their full rules are now available as a free download at the Mantic Games website, along with the Kings of War rules and force lists for every other army released so far!