Is there a reason that Canonical doesn't make upgrading via torrent more front-and-center? It seems like on huge release days like today they'd want the swarm to lend itself a hand.
I guess probably to simplify things, the less links to "get" the product the better, especially if they are going after less savvy users who may also believe that bittorrent is illegal or shady in some way.
They could just build it into do-release-upgrade and use bittorrent behind the scenes, then nobody would really be the wiser.