The info maybe a little outdated for some things but most things are are afaik still in the game.
here are the countdown to open beta previews for
formations / Unit Animation
https://forums.totalwar.org/vb/showthread.php?t=53591
Senatus Populusque Romanus (previewing most of the roman factional units)
https://forums.totalwar.org/vb/showthread.php?t=53849
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