Discount dates differ for Canon Store vs B&H Photo

I was looking at the $500 discount on the Eos-1DX Mark II today. On the B&H Photo website the discount is valid only until September 8. On the US Canon website the discount is available until September 22.

Two questions:
1. I have regularly followed the discounting from Canon. For this $500 discount which has been going on since at least end of 2017, the discount period has always been a full month. Does ending the discount on September 22 mean something? It's right before Photokina.

2. I have never seen a discrepancy on the discount expiry date between B&H and Canon. This time there is a major discrepancy. Does this mean anything?