Is there something I'm missing from the HoloLens?

I don't understand how Microsoft will pull this off.  Am I missing something, or is it just crap?

-A decent battery can't be fit into a device rendering 3D images to interact with footage from the viewer in real time.  

-It looks like it's locked on Windows apps.  A lot of that introduction video looked like an ad for Skype or OneDrive.

-Is there a price tag on this?  Or are they just going to Google Glass it this time?

-What are the benefits of an "HPU?"  Is that really necessary?

-Honestly, I think they should just sync it to a phone (That doesn't require it to be running Windows 10).  I would rather have a huge lump in my pocket than on my head.

I'm not sure if this has been posted yet, but I was wondering what your thoughts were on this.

it has to be synced to a pc