Soon! We're busy preparing it now and will post information on the developer blog when it's ready. Be sure to use the node.acs tag when posting questions about it here in Q&A so that we see them right away.
Check out the blog post! http://developer.appcelerator.com/blog/2012/09/node-js-for-acs-public-developer-preview.html?goback=%2Egde_2950776_member_161083658
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