When mine arrived it asked if I wanted to do the 3G/Wifi or Wifi only, I selected Wifi only and got no activation prompt of any kind.
Mine connects to my Wireless N router just fine, but I don't really know if it's connecting via N, or G, or B, or whatever. I just know it works, and for a Tablet I don't really think speeds above G really will make that big of a difference.
The problem with Android (all android, not just the Tab), is they can't see ad-hoc networks. Unless you root it and make a modification or two (btw, rooting it is not that difficult).
And to those disappointed about the storage amounts...do you not research things? It says all over the internets that it has 2GB onboard and comes with a 16GB microSD card.