I have to say I was impressed. Yes, I was rather skeptical leading up to E3. There has been a lot of focus on single player mode, so I feared a little they were too focused on that. There have also been fears that they might rest on their laurels a bit too much and give us Battlefield 3.5, but this seems to indicate that is not the case.
Of course, the gameplay was rather rehearsed. I really wouldn't expect different, as their intent was to show off some of the best pieces of this map and new features, all with a dramatic skyscraper-toppling conclusion. I am excited to see the extent to which this "Levolution" is implemented throughout the game. Will it feel like a bunch of gimmicks, or will these features become truly immersed features that become a natural interaction with the environment? They have talked a bit about it in interviews these last couple days, indicating that no only can you collaps the street under a tank, but you can also have more minor interactions, such as raising bollards to block a bridge, and shooting fire extinguishers to create a temporary smokescreen.
I am curious to see how big the maps truly are, and how much scale-ability there is on a map such as Siege: how many buildings can you enter; how many floors of those buildings are accessible, etc.?
They also have mentioned you can now dive underwater, and you can fire you pistol while in the water. I am curious whether or not one can deploy C4 while underwater to blow up those boats. I wonder if there is a limit to how long a player can remain underwater.
For more on what has been gathered from the multiplayer livestream at E3, check out the Reddit thread on the BF4 livestream.