I would take a big guess why the new firmware upgrade for the XR500 (VPN, ping assist...) is not (and will not be) available yet. With the new XR700 coming soon I think and it's entirely up to me that you don't have the permission to release it before launch of the new router. I say that because on the advertising they mention the new VPN feature as you can see on the image I took on Amazon.
So it make sense that you release this firmware after October 19th and we have to wait more than 1 month again without any beta testing.
If I'm right I d'ont understand why you're not telling us the whole story and if I'm wrong I would love to upgrade to the XR700 🙂