Other US territories should be able to access the service as well.
The question of US territories is always a strange one for businesses. They're a part of the US, certainly, but complications like shipping costs mean that they miss out on a lot of what's available to those in the continental US.
As of today, it seems that their troubles are over when it comes to Netflix streaming video. The folks over at Netflix sent out emails to customers living in territories like Puerto Rico indicating that they are now able to use the Watch Instantly service.
"This event," writes William-Jose Velez of the Puerto Rico Statehood Students Association, "represents the end of a discriminatory policy that with no good reason, prevented Puerto Rico’s and other US territories' residents from accessing the full service of this company, even when they paid full price."