Here are the Points : I would recommend to test in test environment before dropping in production.
- Site Recycle bin – now capture the site as it’s deleted. Wohoo! This will save tons of unnecessary large database restores. Hmm maybe 200GB databases should be considered.
- Security enhancements –
- Reliability enhancements – I think alone this one for what it will do to make User profile sync will be worth making time to upgrade worth it.
- Storage Reporting for end users – StorMan the interface users had in 2007 to view storage is back and better!
- Chrome Support for SharePoint & Office Web Apps – Nice! More details on SharePoint 2010 SP1 browser support on TechNet (articles will be updated after release of SP1). You’ll also see better consistency with Project Server browser support.
- RBS (Remote Blob Storage) – Remote storage support for shadow copies ensuring better reliability and recoverability.
- New Powershell cmdlet (Move-spsite) for moving Site Collections between databases without moving content back in the db (when using RBS)
- Project Professional now synchronizes scheduled tasks with SharePoint task lists.
- Improved backup / restore functionality for SharePoint Server
- Includes all previous monthly cumulative updates
Source: Thanks Joel.