264 Tag
As David explained in an October post about RDA records, the 264 tag is being used (in some records) for publishing information instead of the 260 tag. As of this morning, when the new index was loaded, the 264 tag information (for both publisher name and place of publication) is included in keyword searches for "publication info includes." Additionally this information now displays in search results.
This nhu-pac search will show you an example of this tag in use:
Title: sneaky pie
AND Publisher: Thorndike