FFXIV Portable would be badass but we really have to consider how the controls are going to be without voice chat. How are you going to type? On-screen keyboard?

I think the good solution here would be to add FFXIV to Steam - This would allow Steam on PS3 to control FFXIV's voice chat and allow messaging and whatnot. Plus, Steam voice chat is cross-platform and is currently on PS3 distributed via Portal.