Chinese automotive insider SugarDesign said on Weibo the vehicle will equip this style of light bar, bringing a more modern design to the vehicle (via Google Translate):

“With the release of new spy photos, Tesla’s mid-term update Model Y is getting closer and closer to us. The split headlight layout on the front face is already very obvious, and it seems to confirm the through-type headlight design mentioned by the “internal netizen” before.”