I am a little disappointed that composing got bumped back, but i'm still excited for the final "awesome" release!
I don't have much experience with global chats, but here are some suggestions that come to mind:
I think splitting it into general and trade makes sense...
Not sure this will make it into the initial release, but definitely something we can add later
General, Trade, and Help chats would be nice. Have them all appear in the same place but with different colors, and the ability to be filtered. Maybe also add an "ignore" preference on players that you don't want to see in the chat too? (could be linked to ignore list). Would be nice to also have color coding or some sort of symbol to indicate guild/ally/enemy in the chat as well!
Definitely going to be making it possible to add moderators to it
Would be nice to have some moderation going on. Hopefully there will be some automated flood control to prevent spamming (limit 1 message per 10 seconds, can't post the same message twice in a row, etc.).
Would the moderators be players? Not sure about this but maybe there could be a link between your karma and your stature within the chat? After a certain amount of karma your name could be submitted and reviewed to become a moderator. OR Players could nominate others who they think would be responsible enough to handle moderating the chat, this would of course be reviewed as well.
Keep up the good work HCS! I am always excited to see new content!