The Eden Story:
The fights themselves are very impressive. I think my favourite of the lot is the Ifrit/Garuda battle. The Idol of Darkness was also very unique, though it was very easy to be left confused by the portal mechanic. Ramuh was alright, though next to the others he wasn't nearly as memorable for me. The final fight was very theatrical and I'm glad the writers didn't use it as an excuse to milk Ysayle's demise by making it overly emotionally charged. Gaia was very different to what I expected, though tolerable enough. I think the biggest takeaway from the whole quest chain so far is that something seems to go wrong every time a Primal is summoned. It lends weight to the theory that it was the case with Zodiark and Hydaelyn as well. I'm thinking that was the lesson hammered by having Ryne attempt to take on Shiva herself, even if it did feel a little forced in regards to the setup.
I'm in agreement with the idea that Urianger and Thancred announcing their departure felt a bit out of place, though I guess it was done at present because there won't be another Eden raid until 5.4. So the Scions returning to the Source in 5.3 seems to be on the table.
Ocean Fishing:
Limsa Lominsa has been slightly expanded to allow for another dock where players board a ship. That was a neat touch.