There is talk on Reddit that AP enhancements are normally not listed in the release notes. If recognition of traffic light/stop sign is taken as an FSD enhancement, may be they don't get listed ? We have to wait for actual owner videos rather than just release notes.
While it is true that release notes don't mention "under the hood" AP improvements, I would expect them to mention any big feature. We did get "auto steer stop light warning" included in the release notes. So if the traffic light feature is just AP detecting traffic lights but not doing anything with it, I would not expect that to be in the release notes. But if AP actually stops on its own for red lights, I would definitely expect that to be mentioned in the release notes.