24-70 f/2.8II vs 24-70 f/4L IS

...seems like we're gonna have a 24-70 f/2.8 II vs 24-70 f/2.8 IS vs 24-70 f/4L IS thread in 2014 >>>

"There are plans to release an EF 24-70 f/2.8L IS sometime in the next 18 months. I have confirmed from two sources that the end of 2013 or early 2014 is the earliest we’d see a production model announced."

Source:

http://www.canonrumors.com/2012/12/ef-24-70-f2-8l-is-exists-as-a-working-prototype-cr2/