Remington debuts the 870 DM pump shotgun, a 870 shotgun that utilizes a six round detachable box magazine instead of the more traditional magazine tube. I have little information other than MSRP will be $799 and several more models will be introduced as next year progresses.
The above wears Magpul furniture and more traditional wood and synthetics are expected.
I can see the benefits of a detachable magazine (DM) for the shotgun for the same reasons as with a rifle, faster reloads and being able to store different shells in different magazines to swap out payload without having to empty the tube.
As I learn more I will update, but I believe the big announcement is due Dec 5th, as this was all the information I received via email this evening.