Maybe it will be only $7K once the post-increase cars get delivered, so probably March time-frame (few may get delivered at the very end of December, but not a lot). In the past when a post delivery upgrade price changed, Tesla used the most current price (for example AP1 activation) rather than the price it was when you ordered your car. That said, this would be the first time an upgrade went down in price, so the policy may change.