I can see Intel Kaby Lake, Cannon Lake processors still shipping in a Mac Mini in 2016, and 2017 but still with 4Gb soldered ram and a 5400rpm spinning disk.
But in my dreams, it would be interesting is if they made the Mac Mini into a flash based, graphics capable VR platform, given that with a Rift style headset there is less need for an integrated screen (imac).
It is interesting to think about what effect VR might have on Apple's offerings. The mini would be great for something like the Rift, but only if it had far more graphics power. And Apple wants to sell screens, so they may go the iPhone route with their VR, if they actually ever do VR. As many people have said many times. it would be nice if Apple had a screen-free desktop in between the Mini and the Pro. With a new Thunderbolt monitor, Apple could still sell screens with their needless desktops. But, they almost certainly won't do it.
Since I put an SSD in my early 2011 MacBook Pro, and went to a gaming PC for games, I can feel comfortable waiting for the right mini, which probably will not come in 2016 (something might, but I doubt I will be tempted). Tempt me Apple!