@DanielMedStortD I believe so. Just have to try it and see :p

I am very happy to report that preliminary results with the Sandisk Extreme 128 GB card are very positive. The model is SDSQXVF-128G-GN6MA, or at least that is what is indicated by the reseller. Below are my results before and after the SD card reader overclock.

Before:
0_1479432422708_Pi3-SDBenchmark-BeforeOverclock-Sandisk-Extreme-128GB.png

After:
0_1479432463937_Pi3-SDBenchmark-AfterOverclock-Sandisk-Extreme-128GB.png

I should mention that the card was a little difficult to jam in the reader on the Pi3 because of a slight protrusion on the card itself. I'm just guessing but I believe it is extra space taken by the flash controller. If you do get this card, don't plan on removing and reinserting it on a regular basis, as it will probably be harder on this card than most. Also, be prepared to pay a premium for this one.

No that I remember although it's an upgraded image as it use to be on 3.7.

Am I doomed? I was hoping not to have to build from scratch.

Is the micro SD card in a "normal"SD holder? Maybe write protection is on....

I have a class 10 16Gb Sandisk and it worked straight away.
http://n2.sdlcdn.com/imgs/a/n/5/SanDisk-SDSDQUAN-016G-G4A-16GB-SDL002017071-1-e591e.jpg

@BuZz Thanks! I will try again and I'll report back here

Yes, using Win32DiskImager will make a copy of the entire card. If you move it to a larger card you will need to choose to resize the image when you write it back. That option is under the raspi-config section.