If you go to Bundle and then select the patchbundle there is the option to Compute the size of the bundle. When you click on Compute in a patchbundle the result is always 0 bytes. The reason that it is not working now is because that every patch is being seeing for a single bundle and these bundles will be combined in one bundle (parent bundle). But, because the bundle has multiple bundles it is not possible to compute the size of the parentbundle. It will be very handy to have this option working so that manualy calculating of each patch is not necessary anymore.