This may have already been noticed by lots of people, but I thought I'd show this because it's interesting. In the battle of Carthage video, between the transition from the birds eye view to the regular camera, at 5:06, you can see what appears to be what could be the battle UI layout. It seem CA may be going back to the central command console, instead of Shogun 2's command console on the left hand side.
| Possible Rome 2 battle UI |

Also we can see that the map of Carthage appears to be colour coded. Places in the city held by the enemy (Carthage in this) are red, while places you control are yellow, and your allies blue. I suppose that when you capture more of the city the map will change to your colour. |
| Details |
Please excuse my cruddy paint skills .

The centre circle will perhaps feature a portrait of the general like in Shogun 2, or perhaps the faction symbol, but otherwise it looks very much like ETW and NTW.
I could be completely wrong though and this could simply be CA's thrown together UI so they can test the battles.
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What do you guys think?