I'm following all of this vicariously. I'm still shooting a D700 + manual lenses and I'm hoping that some newer DSLRs will show up on the used market when these cameras become available.
The most interesting thing to me is to see how Nikon (mis)handles the marketing and PR. Plenty of people have remarked on it. The single card slot needed to have a clear message - "XQD is so much more reliable, you don't need 2 slots" or "2 slots just slow down the transfer speed which is needed for video". Nikon seems to be proud of the video features but they're also not cutting edge.
Mostly I'm happy I will be able to buy a mirrorless full frame camera with Nikon's ergonomics, menus, *metering* and image processing.