A lot of awesomeness in this trailer, however in a live-game(as in, post retail release) situation, I can see the hacking intrusions getting WAY out of control, let alone people just jumping into your game and PKing you all over the place.
The last thing I want in my single player stealth/hacking game is a bunch of asshats trying to constantly hack my phone or run me over or whatever. I assume you can opt out of this random-join nonsense?
Also, this IS ubisoft, any word on the DRM for this game?