My thoughts:
- Field guns -> Artillery
good, 2 range, indirect fire is exactly what was needed
- Starting with a pathfinder
should be optional cause its way better to start with a warrior if you plan to go authority
- Trade routes giving culture
not bad itself but does not fix progress at all.
- Fog of war for the turn (it makes yields map info to dissapear)
indifferent
- Linking wonders to policy tree finishers.
Taj Mahal seems to be very weak for Piety. Reworked Broadway seems to be incredibly strong, but i have not built it - my friend won earlier. Everything else seems good
- Delay for first policy.
New costs seems good overall, besides the fact that it was a huge nerf to progress. In my most recent game i gave progress +2

per every city (upon adopting progress). Sounds extremely OP, isn't it? But turned out it was not
Also Piety now seems to be much more useless due to new timings. By the time additional pressure and faith purchase costs reduction are adopted there is no city to spread to.
New great works seemed to be a move to right direction, but they are not in the right place yet. Recent change was actually a buff to tourism and great works are now even more useless for civs that do not plan to go for tourism victory, This is due to how they affect golden ages and culture boosts. How about archaeological digs giving culture instead of tourism?
I am still strongly against the new naval changes. But in my own games i gave Dromons and Galleas 4 moves instead of 3, and with 4 moves they are quite fun. However, frigates turned out to be real problem. 4 moves + 2 range + move&shoot is just ridiculous. For those who haven't tried - you can shoot a city with about 20 ships per turn! When new frigates become available you basically have two options: 1) if you do not have significant naval force - your coatal cities become undefendable and 2) if you do have significant naval force - nobody can stop you from capturing any coastal city.
And in addition to that - new version seems to be very unstable in multiplayer later on: i could not get past Modern Era on Large map, i had CTD every 3-4 turns