The RAM stick is dying, and the replacement is something most PC builders have never seen

There may be a new memory standard coming to town soon

XDA

CAMM2 is reportedly poised to become the preferred form factor for DDR6 memory

It looks like a daughter board to me. From another site it appears these can hold anywhere from 8GB to 128GB, 256GB planned. Some additional discussion on Reddit [1]

[1] - https://www.reddit.com/r/hardware/comments/1dipisg/what_is_c...

It makes sense that each "stick" needs to be higher density since you can fit far fewer of them flat on a motherboard (especially true for servers, I'm curious to see what that'll look like).