In terms of restrictions - I have come across quite a lot.
It is only obvious to those who like to have full control of their o/s - doing modifications, building their own mini-versions, that kind of thing.
All kinds of extra hassle doing that with win8.
It is entirely possible MS have overcooked the beta versions we have had so far - the rtm might not be quite as bad in that regard. Too early to tell.
Clickers and jabbers probably are not aware of it - not yet anyway.
It is not clear to me if this is genuinely for extra security, or if there is at least an element of MS trying to stop enthusisasts messing with o/s.
In any case,
More Security = Less Freedom.