"With the new Google Sites, you can build beautiful, functional pages to aggregate and distribute content across your enterprise, optimized for every screen. A new intuitive drag-and-drop design experience supports real-time collaboration by multiple editors, just like in Docs, and offers easy access to all your content from Calendar, Docs, Drive, Maps and more. The new Sites also includes themes and layouts designed to scale and flex to any screen size, so they’re as useful when you access them on the 30-inch monitor at your desk or your smartphone on your commute."
Google has clarified that the classic version of Google Sites will be functional for at least one year, and at some point, they will provide options for moving content from classic Google Sites to the new Sites.
Google Springboard is a new feature:
"Google is ... working on a new way to bring all of this power to the enterprise: Google Springboard. Google Springboard helps you find the right information that you need at the moment that you need it. It searches quickly and easily across all of your information in Google Apps including Gmail, Calendar, Docs, Drive, Contacts and more. Springboard also assists you throughout your workday by proactively providing useful and actionable information and recommendations."
Here are the sign up links and the description of the program from the announcement: "We’ve been previewing Google Springboard and the new Google Sites with a small set of customers, and we’re excited to begin to extend each of these new apps to more customers through an Early Adopter Program. If you’re the admin of a company that runs on Google Apps for Work you can express your interest in the Google Springboard Early Adopter Program or the Google Sites Early Adopter Program. "