The AR blogs I find are mostly content-free, not exactly their fault because most demos are just PR demos and the real dev is under wraps at private industry. Similar to the comments here, whoever knows what's up is not talking. Lots of NDAs and patents around the technology.
As for blogs that's kind of what I've found. I've really been itching to get my hands on one and fiddle around with it. I see this as a technology that will only get bigger, and I want to get in on it early and develop a strong knowledge of how it works, and building applications for it properly, and the emulator can really only replicate so much of the true look and feel. I guess for now I'll just have to imagine what it's like with my Vive on...
[0] https://mtaulty.com/?s=Hitchhiking
[1] https://abhijitjana.net/category/hololens/
[2] https://elbruno.com/category/hololens/
Also, I've looked through the MVA for the HoloLens and done some messing around in Unity, but are there any good, active blogs about the HoloLens? I know there are a few like Mike Taulty and some other blogs that might post about it occasionally, but I would like a "Morning Dew" for HoloLens.