Destiny: gunsmith Banshee reputation is live, but where's Armsday?

You should now start grinding reputation with gunsmith Banshee. Except you can't. If you launch Destiny right now you'll be treated to a banner announcing the start of Armsday. Armsday, in case you weren't following, is one of the new features coming to Destiny with The Taken King. Through it, Banshee lets you try out