On another topic: At first I was opposed to the rehaul of the Knowledge tree, but after some thought and play I think it makes it more strategically meaningful, as opposed to just being a tree for "moar science and MOAR SCIENCE", which pretty much everyone would want.
I do think it might be able to use a rename/retheming though. Here are my brainstormed suggestions:
Knowledge ->
Enlightenment (broadens the scope, and contrasts with Exploration as the two "flavors" of the Renaissance Era. Flavor I'm aiming for is somewhat of a mix of the ideals of the French and American revolutions.)
Free Thought (double yields from great improvements) ->
Metric System
Humanism (increased GP rate + 1 Great Engineer) ->
Laureateship (as in Nobel Prize)
Counterintelligence (free defense units + defense building bonuses) -> hmm... either
Constitution or
Partisanship
Secularism (+2 Science per specialist) ->
Scientific Revolution or
Peer Review
Scientific Revolution (+1 Food per farm) ->
Sharecropping
I'm not that well-versed in my history though, so there might be better ideas...