I love crystal ball gazing. Where will we be in twelve months: -
I think most manufacturers will release fixed lens FF mirrorless cameras. I certainly think that is Fuji's intention and I wouldn't be surprised if Canon and Nikon follow suit. Canon's entry will resemble a vintage Canonet. It will be a sales success. In relation to interchangeable lens cameras, in addition to the EOS M3, Canon will release a highly specc'd EOS M3 Pro. Both will use APS-C sensors. The EOS M3 Pro might even be sold outside of Japan.
Pentax might be the odd one out and might announce a mirrorless system. They've developed a strong APS-C following. For years they've been saying that APS-C is good enough (...which it is), but there is a strong interest in FF cameras amongst their users. A mirrorless system will allow the move into FF without disenfranchising their existing customers. Pentax will walk away from retail. Instead, you'll buy the camera directly from them online. Taking some ideas from Ricoh, Pentax will design their camera in a modular fashion and users will have many different options to choose from. You'll customise the camera at the time of ordering. It won't be a huge success, but people will like the idea.
To the dismay of Pentax users, there won't be a Pentax FF DSLR. Pentax will make the decision that they can't easily compete with Canon and Nikon (and Sony) as they don't have the resources to quickly develop an extensive range of lenses and accessories that most DSLR users would demand. However, they will be able to develop a simple mirrorless system with only a handful of lenses.
Olympus will also announce a FF system. They will use a mount which enables M43 lenses to be used (in crop mode) which will make current Olympus photographers very happy. They will have also developed improvements to phase detect AF. The Olympus model will be a very responsive camera. Maybe not ready for birds in flight, but few will complain about AF speed.
The price of all of these cameras will fall in the $1400-$1700 range. That's the new FF battleground. Most people who have used a good crop camera in recent years will wonder what the point is, especially now that the widest aperture, maximum background blur look is getting a little dated.