How come at 1.30 he moves his hand up but the pointer goes down?

Impressive tech. I think it has particularly powerful uses in 3D modelling for designers, architects etc. I'm not sure about in home use mostly for the fact that to be fully realised as an in home device everyone in the house will need their own headset so everyone can use it at the same time. That starts to sound very expensive. Of course for people living alone, or people who are the only tech users in the house one headset will do.

It's a much better in home tech than illumiroom, and I'm pretty sure illumiroom has been binned now that Hololens is the thing.

I don't know why people are buying into the VR vs AR thing. These technologies have very different applications both in entertainment and business. AR is best for some things, VR is best for others. I don't see them as competing because if you want the complete package you need both. I do think for the majority of people, for what they want to be able to do, AR will meet most of their needs to AR will have wider market appeal. But for people who want / need functionality for which VR is the best these people will not go for AR. The question is whether the VR market potential is big enough to be economically viable, and that is no less or more of a question than before Hololens was revealed. Therefore, IMO, Hololens and VR are not competitors for the same market.

For me I don't think I'm in the market for either technology to own. I would really love a Hololens battle arena that augments or replaces laser strike, as the potential for the laser strike arenas with Hololens is massive. With virtual objects and obstacles and even monsters / minion waves potentially being added to the mix. That's really exciting to me.

I'm very excited to see how Hololens can be used in educational settings. I'm a botanist, so it would be really useful for plant morphology and plant anatomy. I also did a micro-CT scan on a flower bud and it would be awesome if I can view a holographic 3D reconstruction of my micro-CT scan :3

This looks really cool. I can't wait to see it in person.

Also, I hope they are sturdy and reliable. Hate to break one by dropping it within the first month or so.

This is really cool, but I'm not sure how I feel about the invasiveness and disconnectedness it demands. It creates a unique situation that is fully immersive, but your OS occupies your space and is not localized and isolated in your devices. Using the Hololens essentially cuts you off from every other person who is not also using the device, but we gamers have a tendency to do this to a degree already. It just seems like Google Glass was more practical, in that you're still fully functional in both realities (It sounds weird to write that.), even if non-users can't interact with your AR. Price may be a barrier to entry, but I'll probably end up with whatever device provides the best experience.

You can also see a mouse pointer moving about multiple times that don't match his hand movments.

That is completely incorrect.  His finger is used to open Skype at 1:30 while his head is used to move the pointer around.  

Yes, I see that now. Seems a tad complicated to use your head as a pointer and then your hand to interact. It means you can't interact with an object that's on the periphery of the field of vision, because you have to be looking directly at what you want to interact with. But as mentioned by people who have used the demo, the field of view is rather small, so there isn't much periphery to speak of.