From the brief description it appears they are taking some ideas from the Galactic Civilisation game. While I haven't played that, from what I've read it soulds fairly comprehensive.
A couple of ideas did spring to mind when going over it though, and I guess we will see more information in the months leading up to the release. However, a couple of questions:
1. Will the diplomatic functions extend to the neutral colonies hence expanding their function in the game other than as a token obsticle to taking a planet?
2. Will diplomatic alliances allow construction of civic and/or military construction in selective ally's planet nodes?
3. Will we be seeing more subterfuge options?
4. Can we expect greater depth in the existing trade, view and military options?