The king is dead, long live the king
In the question: The leadership has changed. A new leader has taken the place of the old leader.
(Modern Hebrew)
Translation
Expression (Hebrew)
הַמֶּלֶךְ מֵת יְחִי הַמֶּלֶךְ
Definition (Hebrew)
בְּהַשְׁאָלָה: הַהַנְהָגָה הִתְחַלְּפָה. מַנְהִיג חָדָשׁ בָּא בִּמְקוֹם הַמַּנְהִיג הַיָּשָׁן.
(הָעִבְרִית הַחֲדָשָׁה)