Strike Team missions, going by the survey leak, are a combination of Inquisition, Peace Walker, and Mass Effect 3. They're randomised, time sensitive objectives you send out AI squads on to ideally complete and return with loot/XP/currency. But they're not static, so like Peace Walker can go up in skill and have their loadouts improved. Some Strike Missions are marked as "Active", which can be played manually instead of via AI. And that basically integrates ME3's multiplayer into the single player, as the characters you use when playing multi are crossover from the multiplayer component, and can be played as co-op.