Yes you will be able to join in on random peoples games if they have it enabled. As far as I know
English
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At all time? [spoiler][b]I AM A GOD[/b][/spoiler]
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No, only in public areas. If they go into a fireteam-only area, you won't be able to follow.
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Not sure but Iv seen a video where the people are just beamed into the game via flye ship thingy
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yeah you see them just walking around, you can communicate through gestures, invite/join their fire team, invite to a party, or just follow them around.