Supreme Court and the Health Bill

Today, the Supreme Court begins hearing testimony on the national health bill. The conservative Supreme Court will consider if it should overturn the bill created by Congress and signed by the President. As the Star Tribune said: "A decision is expected by late June, in the midst of a presidential election campaign in which all of President Barack Obama's Republican challengers oppose the law and promise its repeal if the high court hasn't struck it down in the meantime." What will happen in the Court? Support of the division of powers or new powers for the Court to decide on its own. Remind anyone of the decisions made in the Presidential elections a while back when the Court got involved?