Rollup 2 supports now:
- Windows 8.1 and Internet Explorer 11 using CRM 2013 web application and CRM for Tablets
- iOS7 support with Safari on iPad using the web application
- Support for Safari using web application
- CRM for Tablets using the tablet app for iPad Air
- Windows Server 2012 R2 for CRM Server
And the rerelease does updates to Yammer and Daylight Saving Time.
For more information check the knowledge base article of Microsoft.
If you want to download go the Microsoft download center.