From the Lodestone:
'At the following time, we will be performing maintenance on FINAL FANTASY XIV corresponding to the upcoming release of patch 1.16a. During this period, FINAL FANTASY XIV will be unavailable.
We apologize for any inconvenience this may cause and thank you for your understanding.
* Clients will update automatically upon launch after release of the patch.
* Patch download rates may vary depending on server congestion.
* Comprehensive patch notes will be posted separately on the FINAL FANTASY XIV FORUM on the day of the patch release.
[Date & Time]
Mar. 28, 2011 from 2:00 p.m. to 4:00 p.m. (PDT)
* The completion time may be subject to change.
- FINAL FANTASY XIV'
More patches = more content = more gaming awesomeness!