There are some things I hope they address in Beyond Earth with Rising Tide that are Civ V problems, like adding a basic Casus Belli system.
If I never declare war on someone but I capture enemy territory to push them away from mine--their proximity to me being their reason for declaring war in the first place--I should not be considered the warmonger. I should not receive negative penalties. My capturing of their territory should be considered a just action for an unjust war. Instead with Civ V's stupid warmonger scoring system, if I capture cities as the defending nation, I get the warmonger penalty. I shouldn't be subjected to this shithead declaring war on me throughout the entirety of the match. In fact that should be the warmonger penalty. Unjust, random wars being declared should make every other neighbouring faction wary of the one constantly declaring war.
They already have basic interafctions which could be used for casus belli, they think I settled land they believed was theirs, I bought tiles even near our border after they asked me not to, I won't move my military units from their border, etc.