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Shaan Hurley has documented the AutoCAD 2013 (I guess that will be the name!) system requirements on his Between the Lines blog. Notably missing is support for Microsoft Vista. Windows XP is still supported. It should also be noted that AutoCAD 2013 does introduce a new file format, in keeping with the current 3 year pattern.
CAD Panacea - Blog by R.K.McSwain