In the Zam interview he stated the rough time slot for the first big content patch; approximately easter.
I guess as Hokizaemon said this would be delayed a bit tho.


http://ffxiv.zam.com/story.html?story=25503&storypage=2

"ZAM: Do you have an estimated time frame of when players can expect to see that battle patch?

Yoshida: Right now we're working on a high-end dungeon for hardcore players. We want to have the battle changes ready for when that's released. I can't give you an exact date, but I can tell you it will be sometime in the spring. When the dungeon is released, a bunch of battle changes will also come with it."