Keeping the Social Policy screen as it was, Monarchy and Republic just felt like two other policy trees. Well, now they don't and they - and the associated determinate right policies - feel more distinct from the Social Policies (which are now on a separate tab). Note that, in the image below, the Law tree has yet to be started, so it's layout will actually bear resemblance to the layout of Divine Right and Might (although probably in reverse).
I'm not sure about intending to add more than six policies in those two branches, but I am thinking of at least one (Principality for Monarchies and something equivalent for Republics); which can only be chosen if you have less than three cities (as opposed to the Empire policy's requirement of at least three). Principality would penalize larger civilizations, but you would be free to switch to Empire when this becomes a burden. Other than that, it depends upon how terribly annoying all that blank space becomes for someone looking at it. I'm not quite sure which looks better: the closer together Policies or the other. And frustratingly, the Tradition and Liberty trees appear to be hard-coded to not dim, even when their era dependency is changed.
What this means for the original Social Policy branches (Commerce, Science, Culture, Welfare and Defense) is not double the original amount of choices, as I feel this would be too much (and would be harder to keep distinct), but rather broader categories with six policies each (which means about 48 policy choices). These branches will likely be Commerce, Science, Maritime, Industry, Welfare, Defense/Security, Culture and one other. Of course, they will all technically belong to one branch (the Government Policies branch), which will increase Social Policy acquisition, and allows the AI to make the same varied choices that I want to player to make once they open this tree (flavoured as opening Parliament).
Another change is the effect of Ideologies on your power (Monarchy: Absolute vs Constitutional and Republic: Democratic vs Oligarchical). If you take a conflicting Ideology (such as Freedom with an Absolute Monarchy or Autocracy with Democratic Republic) your policy choice will be reversed (i.e. If you had an Absolute Monarchy but you adopted Freedom you will be switched to a Constitutional Monarchy, losing the benefits of Absolutism but gaining the benefits of Constitutionalism).
Finally, I've changed a few of the political screens to show information about the Government Policy choices of other civs. In the Diplomacy list on the main screen it will reflect their chosen government - this is helpful because Monarchies who declare friendship with other Monarchies and Republics who declare friendship with other Republics gain a small benefit). Then in the Diplomacy Screen the information is given in greater detail, reflecting the style in which other civs have chosen their government. It also reflects the Religion that they are following, even if they weren't the founder, as this wasn't something that appeared to be accessible very easily in the base game. I will likely update this to show who the founder is as well, for easy reference. However, all this information (including the default information detailing Wonders and Era) can only be viewed when you have an embassy with another Civ.
I've also updated the Might OP to reflect recent changes.