ill be disappointed if something lIke this appears before a dual boot OS X/iOS MacIPad.
Such a device makes no sense to me. It would likely involve tradeoffs that make either a poor computer or bad tablet, and likely a mediocre combination of the two. If anything, greater program interoperability while still allowing optimization for the device used would be a more realistic option.
Everyone says they want that, but no one ever thinks about how it would work in real life.
I have a MBP and iPad with Apple's keyboard/touchpad case. If MS Office was feature compatible withe the Mac version it would be a viable portable replacement for my MBP.
The problem comes in when I want to use it as an iPad. I need to detach the case if I want to use it in portrait mode, so now I need to have a place to store the case while I use the iPad. If the keyboard folded flat to the back, as in some devices I've tried, you either wind up with keys on the back where you are trying to hold it or a complex hinge mechanism that would be prone to failure.
In addition, the iPad keys, while nice, are not as good as my MBP. Apple could make a detachable keyboard that magnetically sticks to the back, similar to how the pencil works.
Then there is the issue of ports. A computer needs more than 1 USB-C port for most users. Having them on the screen part means wires sticking out of both sides of the screen. Putting them into the keyboard means designing reliable high speed connections between keyboard and case.
Finally, you'd need a notch on the long side of the iPad screen...
None of this is insurmountable if Apple decides to build such a device; I just think it's not in their plans. Right now, the Mac and iPad are two separate devices, targeted at different markets as well as complementary devices to encourage people who own a Mac to get an iPad and vice versa.