So, to summarize... It sounds like all those radio streams we have found the songs on are all American?
Probably they play these songs there before release to tempt people to buy / pre-order the album. If you pre order tickets in the US you get a copy of the album, so maybe this is another step to try to reach out to all possible customers like with the ticket pre-sale offer... guess the market is tougher over there to sell Knopfler's things? On the other hand several shows fully booked already...