Latest report is that Prime Minster Abbott has personally briefed Chinese President Xi Jinping. From the report, Xi Jinping was "devastated" by the briefing which says that they know something which no one making public yet.
If the objects spotted are indeed debris from Flight 370, then there are likely ultra high resolution images, far better than those from the commercial satellite which initially spotted the debris. Since the debris was initially spotted 4 days ago, that's more than enough time for something like the National Reconnaissance Office to get one of its high end satellites to photograph the region, or heck, even send up a U-2.