Microsoft has issued a video preview of Halo 4 showing off much more than we’ve seen before, but far far short of what you probably want to see.
The video starts with the closing cinematic from Halo 3, so spoilers beware if you managed to not complete that game since the last time Earth had a leap day.
The designers and producers at 343 Industries walk through some of the changes to the Spartan armor and do reveal that multiplayer features the next generation Spartan IV equipment. Master Chief himself was (or is?) a Spartan II, and much of the Noble team from Reach were Spartan IIIs. 343 were not kind enough to talk about armor abilities, but it does seem that dual wielding is gone for good.
Only a small fragment of campaign footage appears, and they’re not revealing the enemies just yet. We’ll probably have to wait until E3 in June for more answers.