I understand their excitementWell perhaps Zbrush people are excited only

3D Coat allow already to add volumes with Voxel scultping!
what 3D Coat don't have is Z Spheres skeleton to adjust your pose. With voxels you can add volume in 3D space
Voxel sculpting In fact Z Sphere 2 is really similar in some sort of voxel sculpting
Like a user said in their forums, Zbrush would just need voxel
sculpting also, to make it more outstanding.
Z brush have been the first company to bring a totally new workflow , we can only thanks them for what they 've brought to 3D industry , and to have show at others modeling tools another possible way of creating detailled models!