Going to throw out a prediction -
The next 70-200mm f/2.8 will have an 82mm filter (not that I think it is or should be anytime soon).
72mm - 20-35mm f/2.8L USM (1989), 28-80mm F/2.8-4L USM (1989), 80-200mm f/2.8L (1989)
77mm - 17-35mm f/2.8L USM (1996), 16-35mm f/2.8L USM (2001), 28-70mm f/2.8L USM (1993), 24-70mm f/2.8L (2002),
70-200mm f/2.8L (1995, 2001 - IS, 2010 - IS II)
82mm - 16-35mm f/2.8L USM II (2006), 24-70mm f/2.8L USM II (2012)