I don't know if what I am describing is the intended behavior or if it has been reported before, but it seems a switch from earlier releases of 3.3, so I thought I'd mention it.
When upgrading from 1 release in the 3.3 cycle (say from RC1 to RC2) on a network, the upgrade is obviously done as a network admin, so one would not be on a site dashboard. However, ever since the release that added the tabbed screen of "Welcome to WordPress", once the upgrade is complete, the user is taken to a URL similar to:
That takes a user away from the network admin to a site admin screen, without any notice. The first time it happened I was checking my own RAM for premature failure.