RCP lists it as a Caucus: http://www.realclearpolitics.com/epolls/2012/president/republican_delegate_count.html
Exit polls are likely.
RCP is wrong.
Take a look here at the Puerto Rico Election Office:
http://209.68.12.238/Primarias2012Rep
Okay, well, it would be possible to poll PR.
I thought there could be 2 hurdles:
* Puerto Rican polls probably have to be Spanish-only
* Usually, when US-based pollsters poll a US state, let's say Michigan, they get telephone numbers from a different company using registered voter rolls. Is that possible for Puerto Rico too ?
In 2008, only Puerto Rico-based pollsters polled the race, but not US-based like PPP, Rasmussen etc.