I'm pretty sure they're only starting the meetings to begin DRAFTING a treaty in the next few weeks...if that's the case, it'll probably be years before it gets to any signing stage...going to google some things to check for sure,
ETA: They are meeting to begin writing it. However according to Cheaper Than Dirt "July 2 through the 27, 2012, 193 members of the U.N., along with non-government organizations, the NRA, public interest groups, and firearms and other arms industry representatives, along with the media will be attending the Conference. Cheaper Than Dirt will keep you updated as the story progresses."
http://cheaperthandirt.com/blog/?p=23006
In addition it has to be ratified by the Senate before it effects the US, however "If the United States signs the treaty, the U.S. Senate will have to approve. However, in July 2011, 58 members of the Senate signed a letter stating their disapproval of the treaty. Further, in the 1957 landmark case Reid v. Covert, the United States Supreme Court ruled that the United States cannot enter into a treaty that violates the Constitution." (Same Source)
So, it seems like it's a non issue. If we sign it at all, it's basically a symbolic act.