Some time ago Hyarume wrote a post, summarizing a lot of the content that we can expect from this highly anticipated game:
Final Fantasy XIV Full Update - posted Aug 26, 2009.

Afterwards, Dontkillmydreams posted a critical article about Final Fantasy XIV compared to other great upcoming games.
Final Fantasy XIV - Can it handle the competition? - posted Oct 14, 2009.

And of course it's good to know the beta applications are open: