Some people have linked a famitsu interview that has some details some people either google translated or quick-translated.
http://www.reddit.com/r/ffxiv/comments/2...ew_for_25/
http://www.reddit.com/r/ffxiv/comments/2...ew_for_25/
Quote:You will need to do a weekly quest to clear all the CT dungeons once per week to get the upgrade item (carbon coat?). This is to prevent the overlap of the armor lockout. Also, they have readied other rewards to entice ppl to do the older CT dungeons. Probably the crafting mat (Allagan Catalyst)
Odin rewards will be armor pieces. This time they are split up so that you can glamour them (specifically for tanks). Other jobs will also get Odin-themed armor.
Allied Seals can be used to purchase upgrade items, but will be way more expensive.
Zodiac Quest continues in 3.0 but not sure in what form yet. I get the feeling he's pretty evasive on that due to the people with zodiacs already have a giant headstart over ppl who don't.
