![speedlite600exbig - E-TTL III a Long Way Off [CR2]](https://www.canonrumors.com/wp-content/uploads/2015/06/speedlite600exbig.jpg "E-TTL III a Long Way Off [CR2]")
We were told a while ago that Canon was working on a new metering system for their flagship flash, we dubbed it E-TTL III. Not much has been said since, although we've seen the announcement of the Speedlite 430EX III-RT.
We're told that while the next Canon DSLRs (EOS-1D X and EOS 5D Mark III replacements) will support the new flash metering system, the launch of the flash is actually a “long way off” and won't arrive before late 2016 at the earliest.
It's worth mentioning the source did say that Canon's new system should perform better than the Nikon's, which has long been superior.
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