lol back to the OP. Bungie has yet to confirm or deny if there will be more. here are two senarios depending on what side of the spectrum you fall on.
1. Of course there will be more, bungie loves us and always gives us something amazing on B-Day. Also they have yet to say they are out
2. Of course there out. There were only 777 and thousands of people spent numerous hours F5ing to get them. Also they have a limited number of swag people would actually consider special.