ExLibris (ProQuest) recently announced "significant progress" on their Central Discovery Index (CDI) product. According to their overview page, here are the Key Benefits:

Increased scalability and an improved infrastructure that is designed to address future challenges

Expanded content coverage

Continuous content enrichment and focus on data quality

Continued content neutrality

Granular resource types

Enhanced performance

Enhanced operational efficiencies for our customers, content partners and Ex Libris

For customers:

Single activation to publish content to users

Faster content update cycles (including new content)

Daily rights update for all customers (electronic holdings)

As Summon Library, we will begin using the CDI in Q3 of 2019.

I will participate in a webinar ("Ex Libris Central Discovery Index: An Overview and Update.") on May 29 at 11am to learn more about their roadmap for Summon, and how we might be able to directly leverage the CDI for our search and recommendation tools. Let me know if you are interested in joining.