The Sims 4 is getting a release date at the event as well. While we don't know much about the game other than it will not be necessary to always be connected to the internet the game has been under pressure to develop the series more emotionally.
The game came under fire for its inclusion of same-sex marriages, which is interesting because Tomodachi Life by Nintendo had the exact opposite problem because they chose NOT to have same-sex marriages in the game. The controversy was eventually the cause for The Sims 4 to be rated for adults only in Russia and some other countries.
The Executive Producer, Rachel Franklin, will present more details and reveal the anticipated release date.