Ganna throw these in here even though these aren't really ideas, just necessities:
In-game voice chat - The PS3 won't be able to install any voicechat software, so hopefully they'll implement a system of voice communication that's readily available to console owners. Of course it should come with a mute/muteall option.
Message centre - They had it in FFXI, would be nice to have, especially when your trying to reach someone and they're not online (for example your trying to get recruitment into an LS).
LS/FC announcement message - In 1.0, if anything major is going on in the LS that involved everybody, one would have to constantly paste in a message and hit enter every once in awhile. So yeah, announcment message!
Ability to punt Lalafells - *gets shot*