Hey, I'd be down for an iPad mini 4 if it is a small iPad Air 2! I have an iPad mini 2, but it's weird having an A7 device and an A8 device. (I have an iPhone 6)
Anyway, I kind of would like for my mom to have an iPad, she wants to use mine quite a bit and yeah. I would buy the mini 4 and give her my mini 2. It'd be a win-win.
And I think this "iPad Air plus" will be a joke if it doesn't have OS X of some variant. I don't want an iPad air plus, with or without OS X, but still. To those of you who say "It's not happening, a touch UI and a Mouse/Keyboard UI are incompatible", I think you're wrong. If they worked really hard, they could add a lot of pinch to close gestures, a fancy on screen keyboard, and stuff of the like (gaming would be impossible with an onscreen keyboard, but Macs aren't big for gaming anyway. I think they should make some sort of keyboard like thing that Microsoft makes for their Surface tablets or something to help fight those 'the tablet that could replace your laptop' crap, and slagging of the MacBooks, etc....) it could be done with a little dedication and effort. If Apple is willing to do that.