In my opinion I believe they have been checking out our nuclear plants since way before 9/11. They have been here all along and are easier to target than bringing in their own nukes.
Their threats are just that - threats and no more. They serve to put us on edge and cause distrust of our leaders, which is exactly what they want - psy-ops - as we've discussed before.
We know they are here in numbers and IMHO I believe they do plan to attack us eventually, but in what format remains to be seen. Could be suicide bombers, could be car bombs, could be worse, but again, that could be tomorrow or some unknown date down the road.
If they have nukes or suitcase nukes, which is possible, either we have been very lucky or they do not have all their ducks in a row yet.
Regarding Haiti, I personally don't believe it has anything to do with Cuba. That's a whole 'nother ballgame. I've been to Haiti and it is a wretchedly poor country. I would have no hesitation calling it a third world country. Also, it is not the only island country with political unrest. It does share the "island unrest" scenario with Cuba. It also shares immigrants desperately trying to escape with Cuba.
Pakistan is anyone's guess. They are flaunting us with sales of killer products to rogue nations, threatening India, providing safe haven for known terrorists, and cultivating friendship with countries that would like to see our faces rubbed in the middle east sands. Political unrest there is a grave matter and I hope we have elected the correct President in the coming months to deal with that issue.