Canon used a different or a limited version of the Digic 5 processors for P&S cameras, so a Digic 6+ may be coming for DSLR's but is likely not ready.
As noted, there is no information about the microprocessor technology inside the custom chip. Canon doesn't supply it, eventually someone figures it out, but its not published by Canon.
They use ARM Processors, but that covers a huge range of possibilities. I've seen it claimed that they used Apple Designed ARM Processors made by TI in Digic 5. ARM Processors continue to get more powerful, so its a tradeoff between power usage and performance. Canon uses more than one digic in their high end cameras, so a big jump in processor power might let them use just one and avoid using more power. The 1D X uses two Digic 5+ and a Digic 4 for autofocus, for example. If one could do it, it might save power or break even..http://www.learn.usa.canon.com/resources/articles/2012/digic_processors.shtml
Expect the Digic 6+ to be used in high end DSLR's probably for 4K video as well as much more sophisticated in-camera processing.