Unless there is an inconsistent decision in another Circuit, the USSC may not take this case. If the D.C. Circuit got it right, there is no need to take it.
The pro-RKBA judges will have nothing substantive (but weight) to contribute to the case, and actually have no reason to grant cert because, strictly speaking, they have nothing to add.
The anti-RKBA judges are actually the ones more likely to grant cert precisely because they don't like the current verdict.
Fenty had to appeal.
I predict SCOTUS will not accept the case. Really, they have nothing to add.