Hey guys, I managed to get a pass into E3 during the weekend, (very unexpected!) and I am going to try to play anything Halo related. I am unsure if there is a Halo 5 demo on the floor, but I will look around and try to play (if they have it) and give the forums some first impressions.
Check out this thread on Tuesday around 7PM PST. I’ll answer any question people might have too. Also if you want, I can possibly check out specific details in game, that might have been announced vaguely.
EDIT #1: The first day on the floor was very overwhelming. I could not play Warzone today, because the line was massive and they would not let anymore people play past a certain point and I was long past it. Tomorrow morning I plan to hit Halo 5 first in order to get a chance to play.
Warzone should be playable on the floor. Not sure if they have anything else available
That’s what I thought as well, judging from all the videos posted about it. Hopefully I won’t have to wait to long in line, but I will do my best to play it.
Any additional information about Warzone you can get us would be greatly appreciated. 
Updated OP and cannot provide any feedback at the moment. I did manage to watch some gameplay, but I am pretty sure everyone has seen the clips I saw. I noticed that all big titles are kept very exclusive. A lot of the smaller titles were pretty open to play, especially at Nintendos section, but bigger stuff is kept very secluded. Check back tomorrow for some feedback.
Awesome man! I hope you have fun there. Anything you find out will be appreciated.