Yes, that's the new layout tool that will be available in next Tuesday's release. It will be appear as "Layout Templates" in the Content & Layouts Dashboard. You'll be able to use either the new tool or the existing card and layout tools to design browse pages. More info later.
Ive been trying to use the new layout tool today. I've been getting a error message saying failure to import collections. When I try to import collection its just hanging there. Is anyone else experiencing this?