Elemental Forums
The rival sovereign actually walked over my capital during the little tour. No diplo UI appeared and the town did not change hands even though it was undefended. Can post a screencap & recent debug to fogbugz if needed (saved a copy of the debug).
Actually you can walk through all kind of things with no effect.
I've walked through enemy cities, units, sovereigns and whatever.
The collision detection really needs some work. 
(On the other hand you can attack somebody one tile away when you move in the position where he last was.)
Wonky all around, seems like. I just noticed that the Capitar (the sovereign walking over capital) thought they were at war with me, although the UI didn't let me know that until I randomly decided to see how the new diplo stuff looks. You'd think folks calling themselves sovereigns would have the manners to let a person know when a war is on...
Did you have a Non-aggression pact?
My most recent game the sovereign went on a walking tour of my property after I made a non-aggression pact with him.
Unfortunately when I attacked him he simply "poofed" without a combat and now I can't find him on the board. Can't confirm it as a bug though as the screen is already full of phantom units because of the units leaving from negative income.
I don't think so. I also walked through Ogres, with which I'm definitely at war. 
I had no Non-Agression Pact. Later in that same game, I saw a Troll walking over one of my towns and doing it no harm. Wonder if it would have attacked any garrisoned troops?
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