The veteran journalist takes over from Luchi Cruz-Valdes, who recently retired as chief.
Lacuna said that she felt betrayed after her conversation with Moreno in early August, during which he confirmed his plans to run.
Araullo and his team took home the Silver Dolphin award for their documentary "Hingang Malalim."
A Pang Masa report claims that Cruz-Valdes will be the new news chief of GMA Integrated News.
Cruz-Valdes is stepping down after 14 years leading the Kapatid news division.