So Amazon has listed Get Together on their site, With the HUGE heading This item will be released on November 12, 2015 (I'm in the UK) making that a Thursday (The new UK release) and November 10th a Tuesday for US which is also right. I believe they did this for Get To Work as well so I think this is the release date!
http://www.amazon.co.uk/Sims-Get-Together-PC-DVD/dp/B014HA64NK/ref=sr_1_1?ie=UTF8&qid=1441210339&sr=8-1&keywords=sims+4+get+together
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-Grab A Drink: Flirt with the cute barista, grab a delicious espresso, and enjoy your caffeine buzz at the cafe. Then meet up at the local pub for a quick bite and challenge other Sims to a thrilling game of foosball.
-Party Anywhere: Throw parties anytime, anywhere! Head out to the ruins or any of your favorite party spots, and set up the DJ booth to get the party started, build a bonfire to heat things up, dare other Sims to get into some hilarious situations, and sneak away for a quick romantic romp in the bushes with the Sim next door.
Maybe Amazon UK updates earlier than the US one or something