One item strangely missing from the RC is Silverlight 4 support (although Silverlight 3 is still supported). This is confirmed on Scott Guthrie's blog:
Silverlight 3 projects are supported with today’s VS 2010 RC build – however Silverlight 4 projects are not yet supported. We will be adding VS 2010 RC support for SL4 with the next public Silverlight 4 drop. If you are doing active Silverlight 4 development today we recommend staying with the VS10 Beta 2 build for now.Tim Heuer has a post about this as well.
So, follow the advice of Tim and Scott, and continue with Beta 2 if you're doing any Silverlight 4 work.
One thing you might notice, when starting the RC version for the first time, is a long delay during startup. This is due to the construction resource caching. In Beta 2, the caching was constructed as needed, resulting in periodic slowdowns. For more details, see this post in the Visual Studio blog.
The closest I could find to a definitive list of changes between Beta 2 and RC is from Jason Zander, General Manager of the Visual Studio Team. Jason provided this general summary of enhancements on his blog:
- General UI responsiveness (including painting, menus, remote desktop and VMs)
- Editing (typing, scrolling, and Intellisense)
- Designers (Silverlight and WPF in particular)
- Improved memory usage
- Debugging (stepping, managed / native interop)
- Build times
- Solution/project load
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