Notice the wording? A source says "the NBA has told the Maloofs to expect the Kings to stay in Sacramento next year." Not that the Maloofs themselves have said it. The NBA has told them.
Could mean three less than exciting things:
1) the NBA is running this show now, not the Maloofs
2) the Maloofs still COULD defy the NBA and apply anyway -- the source doesn't say the Maloofs have said they're staying, but rather the NBA
3) assuming the source is correct, it would seem to indicate if the Maloofs do file, that the NBA has done a straw count, and the BOG would currently vote for them to stay