For hyperbolic PDE's, we have two aspects that distinguish them from elliptic and parabolic PDE's:
- Usually the loss of derivatives is worse than the elliptic case - in fact, even worse than the more general subelliptic case. Typically, you lose a full (weak = Sobolev) derivative in a priori regularity estimates for linear hyperbolic PDE's: the so-called energy estimates. This loss is essentially sharp and can be tracked back to the fundamental theorem of Calculus. As pointed by Willie Wong in his answer, this can be refined if you take into account the characteristic set of the principal symbol of the operator, by means of techniques collectively called microlocal analysis.
- Even if you account for the above loss of derivatives, the "optimal" relative shape of the regions $B_1,B_2$ is different due to a distinguishing property of hyperbolic PDE's - namely, the finite speed of propagation of (perturbations of) solutions. Typically, $B_2$ will be a "cone-shaped" region "shadowed" by $B_1$, whose precise form is once again dictated by the principal symbol of the operator.