[Brightcolours]

Rumoured specs EF 16-35mm f2.8 L IS USM III:

• 16 elements in 11 groups (old: 16 elements in 12 groups)
  
• 3 aspherical, 2 UD elements (old: 3 aspherical, 2 UD elements) 
  
• 790 grams (old: 640 grams)
  

Rumoured specs EF 24-105mm f4 L IS USM II:

• 17 elements in 12 groups (old: 18 elements in 13 groups)
  
• 4 aspherical elements (old: 3 aspherical, 1 UD)
  
• 795 grams (old: 690 grams)
  
• 10 blade aperture (weird??)