For those that are hyper-venalating (self included) ...lets take this one to heart, shall we? I look forward to hearing more about the game during the months leading to release in magazines etc.
*side rant...
Here is my take on why they are holding back on showing us more...
Remember when Todd was showing off TES IV's radiant AI in 2006? ...it was not off screen camera phone footage. It was crisp and clean with commentary... available to the public! He showed us AI shooting targets in town to increase their marksmen skill... and a women using silence on her dog because it wouldn't stop barking. All the AI had a schedule to keep, made sure that they we're eating 3 squares a day, growing their own food. A Dev blog even talked about how a player could take all the food of the town and hide it in a room somewhere, and the town will go to the room for food
Then they dumbed down the radiant AI to do none of the aforementioned, because the un-governed AI's daily agenda would screw up the main quest in some way. If anybody could shed my light on that, thank you... but that's the most details I remember.
SO... Bethesda is playing it safe. They don't want to show you too much, then dissapoint you later when they have to remove features that broke the game. It's possible that they may take away stuff we have already seen! Wouldn't be surprised if the whole 'drop item, AI returns it to you / fights over it' thing was taken out... just sounds potentially buggy, but I have faith that if it is included it will work.
It's good practice to not release info/footage untill you are 99% sure what has been shown will work when the game goes gold
tl;dr....pointing out the obvious, I know. Be patient in any case!