We were initially told about an update to the EF 70-300 f/4-5.6 IS at the same time as the recently announced EF 50mm f/1.8 STM. At that time we assumed they'd be coming out together, but that turned out not to be true.
We're told that the new EF 70-300 IS will have a new USM motor as well as “some feature that one of Canon's competitors have announced recently”. What that “feature” is, we're not sure. The source goes on to say that the lens, whenever it comes to market, is a very good upgrade to the current version.
The same source also confirms that the EF 35mm f/1.4L II will come in 2015 if all goes to plan.
More to come.