See the Catalinas now, but take toilet paper - A few friends watched this report - Mt. Lemmon campsite closures frustrate some people - and understood the report to mean that ALL parking lots(spaces) (except in Summerhaven) are closed - while it is true that many parking lots on the mountain ARE closed it is the picnic/campground area parking that is closed - the Arizona Daily Star article (linked above) has better information especially if you are reading from a 'hikers' perspective, key points from the article:

• All trailheads and vista points along the Catalina Highway are open.
• The service said all restrooms in Sabino Canyon and on the Catalina Highway are closed, including those at trailheads.
• All Forest Service operated picnic and campground facilities in the forest have been closed. All concessionaire operated campgrounds in the forest are closed also.