  Along the lines of nonextensive statistical mechanics, based on the entropy
$S_q = k(1- \sum_i p_i^q)/(q-1) (S_1=-k \sum_i p_i \ln p_i)$, and Beck-Cohen
superstatistics, we heuristically generalize Planck's statistical law for the
black-body radiation. The procedure is based on the discussion of the
differential equation $dy/dx=-a_{1}y-(a_{q}-a_{1}) y^{q}$ (with $y(0)=1$),
whose $q=2$ particular case leads to the celebrated law, as originally shown by
Planck himself in his October 1900 paper. Although the present generalization
is mathematically simple and elegant, we have unfortunately no physical
application of it at the present moment. It opens nevertheless the door to a
type of approach that might be of some interest in more complex, possibly
out-of-equilibrium, phenomena.
