There are some changes in the GOP rules (as I understand it) here is what I found out...This is in regards to new GOP rules:
http://mauldin.patch.com/articles/new-gop-delegate-rules-may-provide-twist-to-presidential-race
Another take is....
There is the distinction between Superdelegates and regular ones
“super delegates “
-> They can vote for whomever they want. Any super delegates who pledged their vote to someone who’s dropped out can vote for another candidate of their chosing.
REGULAR delegates
If the candidate they’re supposed to vote for drops out their option then depend on the state. Some states redistribute any delegates won by candidates who have dropped out to candidates who are still in the race. Others may release the delegates of any obligation.
The candidates the delegates are voting for also have a say in what is happening.
Better than the Democrat’s superdelegates: the aristocracy.
There should not be any Super-delegates and delegates should be bound to vote for the winner of their state on the first ballot at the convention.