The SharePoint product marketing team has a list of resources to help you make decisions about hybrid SharePoint environments.

• Hybrid SharePoint Environments with Office 365 New!
• Prepare for single sign-on (SSO) – Office 365
• The main Deploying Office 365 page
• The Microsoft Office 365 Deployment Guide for Enterprises
• SharePoint Online Planning Guide for Office 365 for enterprises
• Exchange Online hybrid deployment and migration with Office 365

For more information, see the official blog of the Microsoft SharePoint Product Group.