I mean, i feel like it's not crazy speculation like "there are 2 trees in this pic so that means the update will release on the 2nd of December" they were talking about tires, and out of all phrases they write "things will heat up a bit" so that sounds like they're hinting at thermal simulation
On serious note - 0.23 discussion thread is still up. Not locked or removed, like it should be. In addition to that, it is getting pretty late too, so maybe technical difficulties, therefore, it might be released tomorrow?