I have to say that I couldn't have said it better than ToiletSheep did. I also had thought about it aiding with cooling, but I couldn't think of a way. Maybe it can have some venting ducts between the tablet and the keyboard, with a peltier element in the keyboard for cooling? Kind of like that Line Dock thing that was suggested on the thread about cooling pad. With the extra batteries in the keyboard part, it wouldn't interfere with the tablets life span. Another idea is based on what I have seen with microsoft and asus: Microsoft uses a kind of watercooling to distribute the cpu heat to other locations. And Asus has a water cooled laptop which does fit in an external watercooling dock so that the laptop van be used as a gaming desktop with sufficient cooling. If the water-based heat distribution of the surface pro, could be combined with a peltier cooling element in the keyboard part such as the lining dock, using a water cooling connection such as asus proves is possible, that would be the most ideal for having supplementary cooling in the keyboard part
Charging via usb C would be great, but than the tablet part does need a second usb-C port, so that you can charge and can still connect external storage with music for example (I do use a usb C external storage). I also agree about the keyboard weight: the weight it needs to counterweight the tablet can be used useful, by eGPU and extra batteries and extra storage and such, and that way it wouldn't bother that much. And the ability to swap keyboards based on needs would be great. For my classes, I will need the extra battery, for at home I would need the performance GPU for rendering. Also a possibility is to have a desktop-keyboard-dock for at home, just like the keyboard base, but bigger for the use of a more powerful gpu (I can guess the powerconsumption of a gtx 960/1960 would be large compared to the batteries in the kayboard part). At my desk is the only place where I would need a powerfull GPU, so the desktop like setup would be good. It is a possibility. And for families it can also do wonders: everyone has there own laptop, but when one need a big gpu or such things, they can go to the desktop-dockstation to do the task with there own tablet. No need for the parents to open up there own laptop for the children who needs a performance bigger than what their devices have. Interchangeability is the keyfactor I guess.
@pauliunas I think I mixed up between the surface book and the vaio Z canvas on that part, my bad. And I was suspecting that there couldn't be a eCPU. Another possibility is to have a CPU which differentiates between when keyboard attached and when not attached, such as a cpu having different TPD (and that way different clock speed) depending on whether the keyboard is attached or not, such as a quad core cpu which shuts down 2 cores when used as tablet (kind of like how car manufacturers shuts down some of the cilinders). Or have 2 dual core processors with one only activated when the keyboard is attached. This way you can prevent the extra heat when used as tablet, without sacrificing performance when used as laptop.
@Artur For productivity, yes I would use the keyboard and such. But my experience with the surface pro learns that it can heat up pretty hot to the touch while using google chrome for browsing. For use as tablet, I think the keyboard would interfere with cooling, and for the other part would just be bulk interfering with the use as tablet. So for that, I think it would be better to have it detachable for tablet use. And I would invite you to our auditoria, where the lap visibility isn't that great, and I have tried but never succeeded to learn blind typing, and many others aren't able to type blindly (ofcourse, they can it partially but from time to time still have to check).