More on the DC challenge to ban on interstate sales
Josh Blackman has details, including a link to the complaint.
I'd think it marks a tactical transition. Up to Chicago, things had to be a bit cautious. Heller and McDonald were by no means risk-free, but they were carefully focused and calculated, since a loss would have been very damaging. Now, the pro-2A side is free to roll the dice, since it's on the offensive and moving on many fronts. If this, or another challenge, does not succeed, it's not a major loss, and likely there will be a breaththru elsewhere.