Tweet on the AMSA site states the last aircraft (Japanese and Australian P3) have left the area without any further sightings.
So the Malaysian PM press conference may be about something else. Or else tweet is wrong and AMSA are saying nothing until the relatives are told (which seems only correct).
Looking at the maps of search activities, they seem to be searching smaller areas than they did the first few days - despite more assets joining the search. Australian PM has been very bullish also. It does make you wonder what other information they have had.