The time zones are defined as UTC + some offset, so no. What UTC will diverge from is solar time (UT1 in the article), so that solar noon might not happen at 12:00 anymore.
But because the sun's trajectory changes throughout the year, and we live in very coarse timezones already, it was always a bit useless tracking this with seconds precision.
But because the sun's trajectory changes throughout the year, and we live in very coarse timezones already, it was always a bit useless tracking this with seconds precision.