Well, a few days ago I read this post from a Gigabyte employee: "Hey guys, Alan here and I'm a GIGABYTE staff member.
Our inventory stock supposed to pull through this week. Haven't seen it yet, but even afterwards it'll take ~1-3 days to ship out to storefront/e-tailers. Expected limited quantity of our boards until 2 weeks later when we have a gigantic shipment incoming."
I was fortunate to snag one of the Newegg ones that got flown in. Put the system together yesterday with an 1800X.
Going very well so far. No major issues, the system was left running overnight and it's still running now.
Biggest issue thus far: At least for me, I cannot alter memory speeds with the stock bios. Setting XMP makes it look like it's running my memory at 3200mhz, but according to benchmarking and CPUZ, it doesn't.
I haven't tried any other bios yet.
Edit: It seems that while XMP isn't working (for me), manually typing in the memory frequency, timings, and voltage works.
I didn't realize with the UEFI that you can just type into those fields. My Sandy Bridge system just had a traditional BIOS.