Here is the press release from the district on bell times.
According to it, schools with the earlier time( "Tier 1" )will start somewhere between 8:10-8:20, "as determined by the school". End time just says "buses available at schools by 2:45 p.m.."
Schools that start later ("Tier 2") will start between 9:25 and 9:35 a.m. "as determined by the school". The buses will be available at schools by 3:40 p.m.
So, again, at your next PTA meeting, sit down with the principal and ask what your principal and staff have discussed (as they are the only ones the district mentions as who may decide this issue) for your school's start and end times.
One other thing that I neglected to mention. Mr. Kennedy did say that some schools may apply for waivers if their request didn't cost the district money. This might be Hale for example as they already have an 8:30 start time but if the district is claiming "consistency" as one of the major reasons, then there should be consistency and schools should need a major reason for any change of the proposed schedule.