I am shure there will be a solution by apple soon. Just like the "docking block" to compensate the lack of connection with external devices, they will come out soon with a hand-held battery-driven hand-fan to cool externally. Newest design by apple and just for an extra of 99$ - a must buy…. ;-)
Well, to get serious:
Intel is more than 1 year late with his Skylake-Processors. One, if not the only really advantage of them is an enormous more in efficacy due to its new 15 nm technology. MUCH LESS loss of heat while operating than with former processors. I think apple planned to start the MB12" with the Skylake chips (only 5 Watts of power consumption!) - but did not get delivered by Intel. So - they were forced to use the "old" chips for the MBP, the which get much more hotter than the Skylakes. So - no miracle that the MB12" gets often too hot on your limbs. I know that experience because of my MBP15" 2007 - really got burned more than one time by it. Since then, I purchase always the less powerful processor, but the most Memory and SSD I can get. for the MBP…
Well - so there are some serious points NOT to purchase the nowadays MBP12", and shurely not before they´d be delivered with Broadwells:
1) gets to hot
2) screen too dark (look in the apple stores: they are always on MAX Luminosity, More=impossible)
3) still glaring Screen
4) ONE SINGLE I/O : If the USB C port does not work, you will not even be able to charge your MB!
I looked at the new MB12" in a store a week ago:
Impressing form factor, very thin.
The force-touch-trackpad is shurely very innovative - but we have to wait for software using its capabilities.
The new butterfly keyboard is not as bad as some people say. Could live with it - BUT its been developed just because apple´s "Thinness"-fetishism and NOT AT ALL because you can write better with it! So what?
If the single-port-politics of apple does not stop you from purchasing - you should at least wait for the less hotter Skylake processors - which will even be more performant.
Bottom-line: Lay back and wait for 2nd generation (at least with TWO USB-C ports and performance above iPad Air2 performance..
The day they deliver it with Skylakes, OLED Screen AND at least TWO USB-C ports I will purchase (and retire my iPad) - BUT shurley Never Ever before.