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The WP Developer Tools October update is available here on the Microsoft Download Center.
This October 2010 release provides:
This update requires that you have the Windows Phone Developer Tools installed and that language/locale of the update and developer tools match. If you are new to Windows Phone development then go to AppHub at http://create.msdn.com to install the tools and sign up. AppHub has everything you need to learn and start building Windows Phone apps.
If you already creating apps or considering it, join Microsoft Platform Ready and learn how you can get support and a $99 rebate (US only) by getting two apps/games successfully published on Marketplace.