There hasnt been a decent total war historical game since Attila (it was/is fab). Britannia campaign mechanics were poorly realised, 3K was just dull, Troy was just awful. Troy campaign map was lovely but battle interface was so cluttered, a mess of color, while the units were so ill defined and difficult to make out if you looked at them from any great height. When you selected a unit, the actual units disappeared behind the selection mechanism.
Compare how clear and uncluttered units in Rome 2/ Attila looked on battlefield in contrast, especially in respect of Troy. If this is a sign of future historical battlefields, things arent looking good.
After WH3, would CA ever consider TW: Conan ? Probably difficulty with the license as Funcom us4e it, but could be fab with magic lite of Conan.
Maybe I'm talking crap