Revealed ones so far:
http://imgur.com/a/W4P0Y#0
http://destinynews.net/exotics-in-beta
Since only one is allowed, which of the exotics revealed so far are you most interested in using at a time?
[spoiler]I want Sunbreakers or No Backup Plans.[/spoiler]
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As good as it is to have a goal, I'm willing to take what I can get. Sure I'll try for better, but I really like surprises. Aside what faint glimpses I've seen in vids I haven't researched or looked into any exotic gear.