Discussed on Monday during the Ubuntu 12.10
Developer Summit were the plans to introduce a new sound theme to the Quantal Quetzel
Through a community-driven submission process, they've narrowed down the sound theme they're looking for but are still trying to make it sound "more human and less robotic." With Ubuntu 12.10 they're also looking at the ability to customize sound themes and briefly discussed at UDS-Q was the ability to have a LightDM start-up sound.
Another discussion had just after the sound theme session was on creating a proper Ubuntu file-system for embedded devices with minimal hardware capabilities. Notes at least are available here