In a recent interview Mikhail Prokhorov talked about the potential for the Islanders moving to Brooklyn.
Courting the Islanders to Barclays? Our arena, we reached agreement with National Hockey League. Now we can play ice hockey here. But in the time being we have no practical plan with any other team. But we will see in the future.http://www.nydailynews.com/blogs/nets/2012/04/mikhail-prokhorov-in-his-own-words
From this statement it seems like the Barclays Center has been cleared by the NHL as a potential site for a team. If that is the case that is great news for Islander fans, since it means the team has a safety net if they cannot get an arena in Nassau, Suffolk, or Queens.