Earlier this week, Apple filed another revised plan for its "Campus 2" project in Cupertino, a new headquarters for the company focused on a massive ring-shaped building and designed to house 13,000 employees. In line with that revised plan, Apple has once again solicited residents of Cupertino for feedback on the project now that additional details on environmental sustainability and neighborhood enhancements have been fleshed out. Apple made a similar mailing last May when the project was in an earlier stage of conceptualization.