The new system will allow you to save “glamour ensembles” that you can swap to if you’ve already prepared the setup, with all glamours being compiled to work under a single type of prism instead of different types split by crafting discipline. Up to 200 of your most frequently glamoured pieces will be eligible for storage. There’s also the promise of new housing to be released a week after the patch is released, with more information about purchasing changes coming before the patch goes live. And then there are new tomestones, the new Eureka land to both explore and improve equipment, the Ananta beast tribe quests… there’s a lot of stuff. You know, like most FFXIV patches.
As for the further future… we did just get a fanfest site promising a fanfest in November of next year. So, you know, start your speculation engines.