From Sci Fi Wire, Burton Cromer who is vice president of BBC Direct says that Doctor Who will definitely be shown on US TV and that they are in discussions now.
Interestingly though, they decided put the DVD out before any TV deal is finalised because "people were getting ... secondhand copies or copies from the U.K." err... or from bittorrent trackers.
That's a model that might work in lieu of global broadcasts via the interweb. Release the DVD of a TV show globally, then fans can either buy it or wait for the TV broadcast. Presumably the broadcast would still get enough viewers for the TV station to justify buying the show? Don't know but an interesting thought. (And anyway, who doesn't have a multi-region DVD theses days? So they might as well give up on region coding and regional releases).
