Okay, so I don't know what they'd name it, but I would kill for a Surface Pro style device running OSX with a thunderbolt port on it.
Two separate modes of operation, iOS like modes for when I'm in tablet mode, OSX like mode when I'm attached to a real keyboard, pointing device and display.
I'd kill twice if they packed it into something the size of the iPhone6 or 6s.
I would easily pay $4k or more, probably even 5k if they could some how cram 8-16G of ram, 512GB of flash, a haswell chip for docked mode, an ARM for mobile mode into something the size of a iPhone 6s if it had a thunderbolt port and could fully mutate between the two modes, hell, it wouldn't need to share apps, just storage space so that native apps for each mode could access the same data.
I've been wanting this for several years and we're rapidly approaching the point of being able to do a full on developers level of CPU power/ram in a phone sized device. I'm seriously considering a surface pro for this reason but its just not quite there yet, its damned close. If Apple took the same hardware and released it with OSX, I'd buy it and accept the early adopter penalty of having to replace it in 2 years when they get it done right.
I don't want a macbook air, I want a surface pro running OSX in desktop mode, iOS in mobile mode and nothing more than a thunderbolt port for docking.
Apple, please take my freaking money and give me this.