What should we believe about Romney's views on healthcare?

Romney stated long ago that the first thing he will do if elected is work to repeal “Obamacare.”

Recently on Meet the Press he said that he actually agrees with several parts of Obama’s health care reform, such as removing discrimination against people with pre-existing conditions and allowing children to stay on their parents’ plans for longer.

Later a Romney aide came out and said that Romney’s position on health care has not changed.

Here’s an article detailing this whole mess.

What are we to believe? And what do you think about this turn of events?