I doubt it, Israel has been adamently opposed to releasing Barghouti. The subject has been coming up for some time now. We may realize that Abbas isn't interested in exerting control, and that younger, more charasmatic terrorists may begin assuming power. But releasing one of the most popular from prison is a terrible idea. Imagine the message it sends. I doubt Pollard is important enough to Israel, he's not considered a true prisoner, to give in on this, though it could depend on what other pressure is brought to bear. And it would be popular in Israel.
...but it sure as h..l wouldn't be popular in the US.
About Abbas and the power struggle:
It will be very interesting to see what he does with the candidate lists.