They have now switched places with the Squirrel Monkey group that lived at Inca Trail, with both Squirrel Monkey groups now living at Heart of The Amazon and the Sakis at Inca Trail.
The Saki are now back in this enclosure (2 males when I last checked) and there are still at least 2 adults living in the Inca Trail enclosure (I'm not sure of the genders) and I assume they are the parents of the recent offspring.