The schedule is released it just does not show the sponsors yet. Here is a link to NASCAR's website that has the schedule. http://www.nascar.com/races/cup/2008/data/schedule.html
To find this information you can go to the web site below.
2008 NASCAR Lifelock 400 - 2008 TV was released on: USA: 15 June 2008
2008 NASCAR Pennsylvania 500 - 2008 TV was released on: USA: 3 August 2008
2008 NASCAR Samsung 500 - 2008 TV was released on: USA: 6 April 2008
EA Sports Nascar 09 - 2008 VG was released on: USA: 2008
It will be released July 17, 2008.
2008 NASCAR Sprint Cup Series Preview - 2008 TV was released on: USA: 13 February 2008
2008 NASCAR Crown Royal Dan Lowry 400 - 2008 TV was released on: USA: 3 May 2008
Click on the link below to see the 2012 Nascar Cup Series schedule.
Click on the link below to see the 2013 Nascar Sprint Cup Series schedule.
The NHL schedule is generally released the day after the MLB All-Star Game.
In 2008, driving a 36 race Nascar Cup Series schedule, Carl Edwards earned $8,095,200. He also earned $1,301,930in the Nationwide Series driving the full 35 race schedule.