Microsoft released the Beta 2 of Visual Studio 2010 and .NET Framework 4 in 2H of October 2009 and scheduled to launch the RTM on March 22, 2010. But due to some performance and virtual memory usage issue, it has been been delayed.
Visual Studio Beta 2 got significant enhancements and better performance since Beta 1. Beta 2 was 
focused on performance and stability, including integrated tool for SharePoint, including project templates and debugging support, and support for developing Windows 7 applications.
Since the GA deadline is no longer valid and has been delayed, Visual Studio 2010 and .NET Framework 4 Beta period has been extended and another release (RC) will take place between the Beta 2 and RTM in February 2010 timeframe.
ScottGu says-
We’ve also received feedback that the performance and virtual memory usage of VS 2010 Beta 2 is not where people need it to be before we ship.We’ve been doing an intensive performance optimization push the last two months that is delivering significant performance and virtual memory usage improvements across the product. The early feedback from a small set of customers testing interim builds since Beta2 has been positive about these improvements. We still have several big performance fixes in the process of being checked in that will improve things even further.
The goal behind the Release Candidate is to get broad feedback on the readiness of the product. In order to ensure that we are able to receive and react to this feedback, we will also be moving the launch of Visual Studio 2010 and .NET 4 back a few weeks.
You can download the Beta 2 of Visual Studio 2010
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