In the trailer the objective is to steal an item, but gameplay modes can have multiple or alternate objectives.
The puppy item is the new version of the dirty magazine from the old games – it temporarily distracts enemies. Originally the team designed a animal magazine, and then a real puppy, but they decided on the stuffed animal since they didn’t want players to go around shooting puppies.
The ‘E’ in the title has multiple meanings: the ‘E’ from ‘Online’, a ‘3’ (since it’s the third MGO game) and the Japanese kanji character ‘san’ (三), which translates to ‘three’.
MGO is meant to be more lighthearted than The Phantom Pain. The selfie seen at the end of the trailer is an example of that.
Metal Gear Online will be bundled with Metal Gear Solid V: The Phantom Pain when it releases on September 1st of this year.