The Iron Banner is back this month and it's a whole lot different than previous iterations. For starters, the previously control-centric game mode will now be a 6 v 6 team deathmatch. No objectives, just kills. In a news post addressing the changes, Senior Designer Derek Carrol had this to say.

I’d expect to see a bit less Super ability usage, and a lot more shooting across the board, but good teams will work together and hold territory even without the scoring incentives that Control provided.  This will be the first time we’ve played Clash with power differences enabled, so it will be interesting to see how power affects this most basic of 6v6 gametypes.

The other half of Iron Banner, the loot, is also getting a makeover. Bungie has increased the reputation gains for a win by 20%, increased the overall drop rate, and introduced rewards at ranks 3 and 5. In addition to that, you'll also be able to purchase artifact weapons from Saladin straight up. They aren't the most powerful weapons out there, but if you've got alternate characters they are a good option.