While we can imagine the list of restrictions on this streaming gig are quite lengthy, the company has stated that it will support "DVR-to-PC connectivity, " thus enabling DVR viewing on a networked PC, though there's no mention of supporting wirelessly connected computers a la Slingbox.
From what we can tell, it's basically a PC-based DVR (running on XP Home, rather than Media Center) that ships with a base unit and two remote boxes that can be connected via Ethernet.
The Broadcast Flag is supposed to prevent people from sharing shows or transferring them from their DVR to their PC, which is why TiVo needed a waiver of sorts to add TiVoToGo.