Most everything for diplomacy has been implemented, except for relations improving due to trade/research over time, and icons for "Outbox/Inbox" messages that you can click on to see the messages that has been sent from other empires.
Let me explain how certain features will work (Note, subject to gameplay balancing and tweaking):
Trade will start at -5% and increase up to 15%. The percentage is based on gross income of your empire and the empire you're trading with.
Shared Research is that, when you and an empire have this agreement, you share what you're researching. So if you research 10 points into Laser Cannon, both the other empire and you gain 10 points (or 5 each, subject to balance) in Laser Cannon. So this way, you can research items that you're advantaged in (for example, if your race is good with beam weapons, then you gain bonus with that field, and it will affect the points that the other empire get)
Non-Aggression allows you to pass next to their fleets, and not fight at unclaimed systems. However, they can attack you if you're next to their inhabitated system.
Alliance allows you to be adjacent to their inhabitated systems.
Harass Selected Empire, if accepted, will hurt the relation with the selected empire and both you and the empire you've asked, as well as your relation with the empire you're asking. Reconcile does the opposite, but hurts your relation slightly with the empire you're asking still. The reason is that when you beg the other empire to do something, it degrades you in their view. Think of begging your big sister to stop a bully from picking on you.
Now here's the screenshot of the semi-final diplomacy screen!
The artist has completed two race portraits, so I think this would be a good time for me to introduce two of the races that will be in the game.
First up is the Humans. You can see his portrait from the screenshot above. They love war, they create businesses around it. They specialize in ballistic weaponry, missiles, infrastructure, and agriculture. They're definitely not your "Star Trek" happy peace mongering humans.
Next is the Zero People. They're sentinent computers, devoted to making the universe a series of ones and zeroes. Their creaters was easily overpowered by the Zero People because they relied on computers for nearly everything, and when Zero People gained sentience, it was a simple matter of taking over everything. They specialize in infrastructure, pop growth, computers, and production. This is their portrait:
Humans and Zero People races hate each other. It will be difficult to maintain a stable relation between those two.