But, we're *getting* the first full blown expansion. Mercenaries. In Feb.
That said, I don't see word of the invasion update in it's feature list. And it's off the roadmap.
There is something of a curse of being as open about their development plans as Stardock tends to be, in that roadmaps can and do change. It takes quite a bit of resources to implement a new feature, and sometimes there are second thoughts in strategic planning. Have you ever started planning to conquer a rival civ in game, only to check things out, realize you are too far behind them technologically or find another civ that's a better choice for some reason to consquer? Plans change.