The CSS Working Group has resolved to add a new display type for what we've been calling masonry, but it will not be
display: masonry
display: masonry
.
I plan to submit a comment on the issue (which you can find here, but I'm curious what others think about it as well.
One thing they have agreed on is the word "grid" should be be included in the name, and at this point I believe there is no fighting that (I also think it's a good call for a few reasons, but I won't worry about those yet).
When they first resolved it, it sounded like it would be