I picked it up. It's a good read. Don't go in expecting anything really as it's a one shot comic. It does deal with the aftermath of Mama and delves a little deeper into Dredd lore with Mutants and the cursed earth.
I'm really hoping with the fact that the video sales for Dredd are so good, its pretty much universally loved, and the comic sold out before it even came out, that the studios will take another look at doing a sequel. Also can't forget the fact that Urbans new show Almost Human has been getting fantastic reviews and people are actually excited for it. I mean if riddick can get a sequel due to blu ray sales, why can't Dredd.