No matter who emerges the winner when the Suffolk County Board of Elections releases its unofficial vote count on Tuesday night, East Hampton Town will have a new supervisor and she will be a woman. Councilwoman Kathee Burke-Gonzalez, who is the deputy supervisor, is running on the Democratic and Working Families Party lines to succeed Supervisor Peter Van Scoyoc, who announced earlier this year that he would retire from town government. She faces Gretta Leon, the Republican and Conservative Party nominee and a political newcomer.