Folks, I pre-ordered the RF 16mm f/2.8 when I stumbled onto the Amazon listing (now gone). Here's a screenshot of the order which gives a glimpse of the lens. The only information on the page, which I've already shared, dimensions, weight, and focusing distance. It did not contain the full specs that you'd typically find with a lens.
And here's a larger screen grab from the "order details" page with a clearer picture of the lens and the $299.99 price. I saw nothing about this being a macro lens. Perhaps someone inferred that from the the close focusing distance. Again, details were scare.
Attached is a side by side with the Amazon picture of the RF16 next to the RF50 both scaled to the same size based on the mount ring diameter. They look similar but the lens is smaller in diameter on the RF16 and the bottom of the lens protrudes where it does not on the RF50f1.8.