And, if they haven't changed things, you can actually keep VS2012 RC forever, simply forfeiting updates. And updates for the JS support are rather unlikely. The .NET technology updates are really what you would be missing, but if you only want it for JS support, you really aren't missing out on anything. The RC version is as close as their betas come to the retail release. So I highly, highly suggest to grab it now while you can. As soon as retail release comes out, it will be gone.
The only word of warning is that VS2012 is ugly on Windows 7, because it is supposed to mesh with the Windows 8 Metro style. However, it is not the worst-looking IDE I have seen by a long-shot. It is just ugly for a Visual Studio release because, while it is supported by Win7, it is built for win8.
But go grab it! You have nothing to lose, and I don't think you will be disappointed.
Instructions for the site: Click the purple "Visual Studio" button, then click "Ultimate", then select "Visual Studio Ultimate 2012 RC - English Web Installer". It will download a small file. Open that file, and then that will direct the rest of the download and installation. It is big, but you will eventually get some options to strip out some of the other support to shrink the installed size down. Just be sure to leave in the Web support!
