It seems unlikely that Bill A10427 will succeed, according to Michael Mulgrew.  This has been our assumption from the beginning as well.

“I don’t believe at this point in time it can pass in the next legislative session because it has been so highly politicized,” Michael Mulgrew, president of the United Federation of Teachers, said during a panel discussion hosted by City & State and moderated by Chalkbeat.

Mulgrew’s comments underscore the challenge ahead for de Blasio’s plan, which calls for eliminating the single test that determines admission at eight of the city’s top high schools and instead admitting the top 7 percent of students at every middle school across the city. At three of those high schools — Stuyvesant, Brooklyn Tech, and Bronx Science — state law mandates the use of a single exam for admission. (The legislative session begins in January.)

https://www.chalkbeat.org/posts/ny/2018/08/23/michael-mulgrew-shsat-bill-de-blasio-albany/