For those interested, a summary of my first experience with the patch:
I played Indonesia on SEA TSL on Emperor last night, up until renaissance. I Found it very hard to get production going on the tiny starting island and the Kampung feel a bit underwhelming in that regard. The additional Production per adjacent Fishing Boat only kicks in at Civil Engineering, despite the loading screen toolltip suggesting otherwise. Civilipedia clearly states that it's only later on, but I had already gone out of my way to purchase some 3rd ring sea resources just to be able to get extra production going.
Trying to tackle the production problem, I went for Meeting Houses, which seemed the right choice given the pantheon belief I chose of +1 faith per tile with charming or greater appeal (can't recall the name). I produced so much faith, that I could quite easily build a 'free' navy thanks to the Indonesia trait to explore and try to settle surrounding islands, though they were swarming with barbarians..
Trying to spread my faith to another civ for the first time, I ran into Khmer, who founded a religion the turn my missionary arrived at his doorstep. Which leads me to believe that getting a religion should be more realistic in this build on higher difficulties. Going further north though, I ran into the real problem called China. By the time I was about to reach renaissance, they had just hit Modern, had double my science (I was 2nd/7) and out cultured me like crazy. Obviously pumping out wonders like madmen.
Im not sure I chose the correct path in this game, but I feel it will be very hard to ever compete with China on this TSL map. At least with Indonesia.