Looking at the new finalfantasyxiv.com, I think what has been removed is more conspicuous than anything else.

That site exists primarily to provide a taste of FFXIV to people who are new to the game. Up until this point, it has been filled with information on 1.0. Not anymore.

To me, that says that the XIV team thinks that 1.0's remaining lifespan is now short enough that it doesn't make sense to sell a brand new player on it. Though 1.0 still has several months left before it goes offline, the devs may feel that there isn't enough time for the average casual player to make a purchasing decision, start the game, and progress to a point where they get a lot out of the current version. The seventh umbral era storyline is one of 1.0's big selling points, but we may be approaching the stage at which slower players (and people without much time to play) might run out of time before getting to experience it.

The flow of the game, including the means by which the average player levels and experiences the main storyline, will be changing with 2.0 as well. People who have not progressed very far in 1.0 may find it preferable to start anew when 2.0 hits, as they will be able to learn the new systems and experience the new story from the ground up. Throw in the fact that there will be a period of up to one month between 1.0 and 2.0 where our original characters will be inaccessible, and it makes sense that the dev team would want to stop advertising for 1.0 a good bit before the relaunch.

They may not be ready to open the floodgates of 2.0 information just yet, but at a certain point it becomes sensible to stop stop tempting new players to 1.0 and just have them wait for 2.0's open beta. That may be why 1.0's promo site is now history.