The Square Enix Members site has put up a page dedicated to FFXIV. The site isn't exactly a source of breaking news, but it does have a nice Photo Essay of e3 2009 and an Open Mega Theater of trailers. There is also a Fan-Powered Q&A section, in which users can submit questions they would like answered at e3. Strangely, FFXIV is on that list, even though it was kind of released after the fact...

Anyways, once you've registered the Title Page is at http://member.square-enix.com/na/features/e309/titles/ff14.php

It's unlikely any exclusive information will be released through this page, but in the least perhaps a few user submitted questions might affect answers given and it will be a source of trailers and screenshots.

There's also a FFXIV group, similar to Facebook, so might as well join that!