Last week, we released XNA Game Studio 4.0 and the Windows Phone Developer Tools. However, there was a slight delay in the release of the new XNA Game Studio Connect beta that allows you to deploy, run and debug 4.0 games on your Xbox 360. As announced on the XNA team blog this morning, the XNA Game Studio Connect beta is now available for download on the Xbox LIVE Marketplace.
You will need to delete the version of XNA Game Studio Connect that you have installed on your Xbox 360 console, then download the new one. You can find more detailed steps in this blog post and this news item.
If you are planning to use XNA Game Studio 4.0 for Xbox 360 game development, I encourage you to download and try out the XNA Game Studio Connect beta. If you run into any issues, please report them at the following locations: