More Microphones, I feel like they are overlooked in someones setup but when you are a broadcaster or just even use TeamSpeak or Mumble a nice mic really draws people in.
Also Windows on a iMac for some 5k gaming sounds really neat. Also very curious about the real world gaming performance of the R9 295XM.
From what I read and viewed (teardowns and mini reviews), it should be possible to charge from any usb-c port, but only from one port will the charging be done, not all at same time.
Besides, you're limited by the battery's capacity to "absorb" electricity... if you pump too much power too fast, you end up with Samsung Note 7 effect, you overheat the battery, cause gasses to form inside and overall you just make the battery go bad prematurely.
The energy that goes in through one connector alone is probably close to or more than enough to charge the battery at maximum safe level.