Taylor Parks, best known for her part of Little Inez in Hairspay, has posted to her Twitter account about a recent voice acting experience she had with EA. When a user asked her if this was for a expansion pack, she was kind enough to confirm.
Simsvip got a screenshot of the tweets, as they have now been removed.
I have been reading comments by users and a lot of people are suspecting that the first expansion pack for The Sims 4 will be Seasons.