On June 9, The Sims will be at the EA Press Conference in Los Angeles, CA. On the official forums, SimGuruHydra put a post out telling any simmers who will be in/around the LA area on that date and wishes to attend the E3, to send an email to SimLeaderAlpha@ea.com with the following:
*Confirm you are over the age of 18
This information needs to be sent before June 4!
If you are in the LA area or are planning on being in that area on the 9th, you still have time to submit the above information to reserve your spot and be present for information to be released on The Sims 4.
Maybe a release date?
For more information please see this post Attention Simmers!