They’re now called Large Single Pocket Pages and are available to order now!
From the description on the CM website:
“Each of these side-loading single pocket pages holds two sheets of 12x12 paper and fits easily into any of our 12x12 Flex-Hinge® Expandable Fast2Fab albums or coversets. It's also great for adding certificates, documents and other memorabilia to your albums!”
Multi-Pocket Pages Coming Soon!