Releasing pollard has been a topic of conversation during all the peace talks over the past 10-20 years. As others here noted, if the US is actually serious about it, it means that they will ask for something really draconian in return from Israel. Hearing this scares me more than anything else.
People should realize that the US is not a benevolent friend of Israel for friendship's sake. They only care inasmuch as the relationship benefits them.