According to Brazilian fansite SimsDomination, The Sims 4 will release around 18th of September.
— SimsDomination (@SimsDomination) February 20, 2014
I can’t say that this is the final release date for The Sims 4, since various retail websites are telling different things. Spanish retail website listed The Sims 4 Collector’s Edition, with release date set to 26th of September.
Let’s not forget the fact that EA stated that The Sims 4 is coming in Autumn/Fall 2014, and Autumn starts on 23rd of September.
One thing is definitely sure: The Sims 4 will release this September! Brazilian version of TheSims.com accidentally mentioned that The Sims 4 is releasing in September 2014, instead of Fall 2014.