Check out the footage for Rainbow Six: Siege.
Siege pits 5 players versus 5 players in different situations like seen in the hostage situation above. Players kidnapping the hostage setup barricades and other traps then both sides fight to hold hostages or rescue them in intense back and forth action. At least that was this specific situation.
Although not much further information has been given, this seems to be the evolution of Rainbow Six: Patriots which was one of the most impressive demos from a few years ago.