You can make Metro styled apps with Visual Studio 11 Beta for Windows 8, with the correct SDK. Reading the article you linked gave me this link to download everything you need.
Download that, follow the tutorial you've already got.
Update:
As @bobsmith833 mentions, Metro and WinForms are different frameworks entirely. There's no way to use the two together. You'll have to go for Windows 8 and the Metro framwork if you want to make these apps.