There was some confusion with yesterday’s news that an EF 24-70 f/2.8L IS lens could be around the corner. It is the EF 24-70 f/4L that appears to be close to announcement. Quoting Canon Rumors:
A new EF 24-70 f/4L IS is on the horizon. It appears something was lost in translation in regards to yesterday’s rumor. While a prototype of the 2.8 version in IS form exists, the f/4L version is what will be coming to market.
Neither the price nor the announcement date are known.