Hey,
ich habs! Hier meine Lösung:

Code:
\makeatletter
\newcommand*\split@colors{}
\def\split@colors#1/#2/#3{%
  \xdef\thecolor{#1}%
  \ifx\relax#2\relax
    \xdef\thetxtcolor{black}%
  \else
    \xdef\thetxtcolor{#2}%
  \fi
}
\patchcmd\pgfpie@findColor{\xdef\thecolor{\c}}
{\expandafter\split@colors\c//}
{}{\typeout{Could not patch \string\pgfpie@findColor. Strange things may happen...}}


\patchcmd\pgfpie@cloud
  {\node at (#1) {\scalefont{#3}\beforenumber#3\afternumber}}
  {\node at (#1) [\thetxtcolor, /every only number node/.try] {\scalefont{#3}\beforenumber#3\afternumber}}{}{}
\makeatother