Much of this smells like vapourware - or certainly something which wouldn't be useful for many of the use-cases people are imagining (watching your own videos in hotels, complex presentations etc.)

The differences between the tablet screen and the big screen have already been noted (especially visible in the 3D scenes). Other times we can see "Full HD" being decoded which is going to need more than a USB->VGA adapter: *something* is doing a whole lot of donkey work here, and it's not going to be a pocketable USB dongle; more like a laptop or other computer running a full-blown OS. Which then leads to the question, what's the point?

Having said that, from watching the video it seems hopeful that we might see two things:

1) A driver for the various wifi projectors etc. that are now available.
2) Drivers for an (official?) USB->VGA/.../... adapter from Nokia.

In particular, an official USB->VGA adapter from Nokia would be enormous for no other reason that it'd be a proper after-sales add-on, supported by Nokia for more than just memory cards or USB chargers.

Although I echo Karel and YoDude's sentiments: so much of this cool stuff is going on behind closed doors, with occasional glimpses popping out - often of half-baked software. My N810 doesn't yet do what I bought the 770 to do, but it does things I didn't know I wanted very well. Still, a more varied, rich and polished set of bundled apps would be helpful :-)