Syabas who produces well-known HD networked media tanks Popcorn Hour and media streamers PopBox, just announced a support of Matroska 3D container on its devices. That feature will be available via free firmware update. The owners of the Popcorn Hour C-200 and the A-200/210 can get support of MK3D even now. PopBox update is on the way.
Actually this is a nice feature. Especially no other media streamers can do that. But the problem with to find some 3D movie converted from 3D Blu-ray to MK3D. I guess only Torrents will an option.