What is "preview of quality rollup"

Solution 1:

A "preview of monthly rollup" patch is just what it says. A preview. Of a monthly rollup.

Definition: A tested, cumulative set of new updates that are packaged together and distributed over Windows Update, WSUS, System Center Configuration Manager and Microsoft Update Catalog ahead of the release of the next Monthly Rollup for customers to proactively download, test and provide feedback. The Preview of Monthly Rollup is product specific and addresses new non-security updates, and includes fixes from the latest Monthly Rollup. This Preview of Monthly Rollup would be displayed under the title Preview of Monthly Quality Rollup when you download or install and will be classified as an "Optional" update.

Presumably, these will be included in the following monthly rollup (at least the ones that work and don't cause too many problems), so my preference is to ignore these, and let someone else fill the role of unpaid beta tester. YMMV, I suppose.