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He's probably gonna step down or announce some type of change to his role. He knows that the SEC is scrutinizing his every tweet so saying "TESLA NEWS TOMORROW" is his last hurrah. If you're a $TSLA investor get ready for the house of pain tomorrow.
Model Y would get it's own event, its a very big deal. This is too sudden to be that large of an announcement, IMO. It's also the wrong time of day, they wouldn't release a new product like Model Y or Truck at 2 in the afternoon - Elon likes night parties
My guess is it's just a blog post that gets released at 2PM pacific (aka when markets close) that says "all cars being sold today are equipped with HW3" and some details about why that's a great thing.