I agree with Mark's conclusions about this NOT being an AP 2.0 announcement. Even though the timeframe fits both as "end of the year" and after a blowout quarter -- it seems unlikely given the last-minute nature of the event and the fact that Elon stated at All Things D that if he talked about it (then) it would be "really big news".
I expect AP 2.0 to contain enough hardware to be ultimately capable of ~L4 self-driving, which, if true, will mean that Tesla will deliver end-user L4 hardware years ahead of everyone else, even if it's only operating at L2 while the system learns and improves. This should be enormous news.
Further, I suspect Elon would love to bundle the AP 2.0 event with the Model 3 2nd reveal, if the timelines aligned (maybe late December). To me, that's the original iPhone "Are you getting it??" moment and an immediate race toward 750K reservations. It's staggering how much mindshare that one fusion of reveals would create.
For next week, I honestly have no idea what the announcement could be, but I suspect it'll be somewhat disappointing considering the general expectation-level.