Ever since I got Ambitions my SP has gone wild. There are so much more people now and you co-workers have houses. Also sims are moving in and out like mad. When I checked Working Friends Madison and the others weren't there- 2 random people, a Semeko, and Erin were there! I love the new SP. I would love to hear things that you found out or stories, thanks!
Edit: Also, lots of new townies are moving in.