Pollard should have been executed or sentenced to life without parole, but under his sentencing in the '80's, he is eligible for parole unless he (1) misbehaves in prison or, (2) is likely to commit additional crimes - neither of which is likely.
Regardless of any Presidential action, he is most likely to be released anyway - it's the law.
Israel has killed more American military personnel in the past 50 years than North Korea (USS Liberty attack) and should not be given preferred treatment under any circumstances. I don't like it that Pollard (an Israeli citizen and hero) will be released and go to Israel to a hero's welcome.
