There was also a new 9.7" iPad every year until 2015, but now that Apple has three iPad lines to juggle it seems likely that there will be staggered releases. Also, while the Mini 3 was technically a new model I don't know that I would count it as an upgrade given that it was just a Mini 2 with TouchID added. Heck, Apple discontinued it less than a year after release and now just sells the 2 and 4. So, in effect, Apple has already skipped a year for the Mini. I would be surprised if there's a real update to the Mini in 2016. If there is a Mini 5 this fall, it'll probably just be the 4 with a Rose Gold option and faster TouchID. Maybe 3D Touch depending on how successful there are at applying it to different display sizes.