PowerShell 3.0 does not ship with help files. Instead, they need to be downloaded separately using Update-Help.
Unfortunately, PowerShell 3.0 help isn't localized, yet, and only available in English. Non-English systems refuse to use the English help files, though.
Fortunately, there's now a hotfix available that addresses this problem and allows a non-English PowerShell 3.0 to use the English help files if no localized content is available: http://support.microsoft.com/kb/2809900/en-US