That's the problem wiht the media. They need attention grabbing headlines in order to sell their papers/magazines/web subscriptions. A headline reading "Scientists Discover a New Fossil That May or May Not Be a Human Ancestor Pending More Information" is not as catchy, nor as sensationalistic as "Oldest Human Ancestor Ever Found!!!" And now, on the other end, "Ida Fossil May Not Be The Human Ancestor It's Discoverers Thought According To New Studies" isn't quite as "good" as "Fossil Hunters Wrong, Ida Not Human Ancestor!!!"
It's sad that all most people know about science is filtered from actual science journals through Pop-Science magazines to a newspaper whose science desk is the second hat of the sports writer.