The Peruta arguments will be incorporated for the en banc review, as they emanated directly from Heller, McDonald, Moore, and even the (overturned on appeal) Woolard case in MD. The arguments are sound; are based squarely on the Supreme Court's reasoning in Heller and MCDonald and remain as compelling as ever.
I suspect when (not if) the ninth circuit overturns Peruta decision it will closely parallel Judge Thomas's dissent in the original three-judge panel decision.
They will seize on language in Heller, absent the essential context for it, that concealed carry is not protected under the second amendment. But in Heller, in each cited case where a concealed carry ban was upheld, there was open carry available to satisfy the right.
Setting aside the absurdity of relying on California's (then) unloaded open carry requirement, the original district court decision with Judge Irma Gonzalez relied on (unloaded) open carry to satisfy the right. It was used as justification for discretionary issuance of CCW licenses. But even unloaded open carry was since banned by the CA legislature, strengthening and simplifying the plaintiff's argument in Peruta.