Of the newer zones, I wish they'd give us a real event in Rakaznar Inner Court. The Vagary fights and August in the Turris are nice, but something that takes us to one of the coolest zones in game, daily, would be superb.
SoA was supposed to have another chapter where, iirc, you get to properly meet August and fight through Tartarus. I always assumed Ra'Kaznar Inner Court was meant to be used in whatever content they were planning for that zone.
It seemed like they pulled the plug on that chapter though when they saw that FFXIV ARR's launch wasn't going up in flames. It's really a shame too, it seemed like the SoA storyline was a passion project on the part of Yaeko Sato (CoP writer), so she had to cobble an ending together for the 5th chapter. Still turned out great IMO, but that's more a testament to her skill as a writer than anything else.