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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Just got heart of praxic fire tonight. Really really hoping to get raid helm and gloves so I can use it regularly.