Details of a proposed collective bargaining agreement being pitched to NFL owners Tuesday, according to sources: • Players get 48 percent of "all revenue," without extra $1-billion-plus off top that previously had been requested by owners. • Players' share will never dip below 46.5 percent, under new formula being negotiated. • Teams required to spend close to 100 percent of the salary cap. • Rookie wage scale part of deal but still being "tweaked." • Four years needed for unrestricted free-agent status. Certain tags will be retained, but still being discussed. • 18-game regular season designated only as negotiable item and at no point is mandated in deal. • New 16-game Thursday night TV package beginning in 2012. • Owners still will get some expense credits that will allow funding for new stadiums. • Retirees to benefit from improved health care, pension benefits as revenue projected to double to $18 million by 2016. -- ESPN's Chris Mortensen, John Clayton and Adam Schefter