This is the disconnect. The very meaning of the words "priced in" indicates "at the present time". If something "will be priced in in the future" then it is, obviously, not priced in currently. I think there is a clear difference between news -- upon which speculators react dynamically -- and future demand spurned by that news over time.
See, then this is pointless. When you ask if something is priced in then all you are asking is "what is the price right now".
No, that's not it. When you ask if something is priced in, you're asking if speculators have acted on it to the extent that they will. If news came out today that Amazon will accept bitcoin, there would be a threshold at which speculators would stop buying based on the perceived future valuation. So if the price jumped from $215 to $600 in two days, you could be fairly sure that the news was being priced into the market to some extent. The full extent is obviously subject to speculation -- and that is
specifically the question of whether or not something is "priced in."By your definition, there is
never, ever an answer. Nothing is ever priced in, because we have no idea what future demand looks like. It is much less tangible -- especially because of the multitude of variables and the inability to isolate the effect of any one event on future demand. Perhaps the first reward halving will be "priced in" two years from now. How would we know?
The bitcoin exchange markets are not sophisticated enough or liquid enough to have much "priced in." I would speculate that <5% of any rumor is ever priced in before it is news.
And once it is "news" I think a lot of speculators in bitcoin exchanges are not leading the action, they are following it. The market is too volatile to try to lead. And most dont have the financial leverage to take those risks. Therefore, if the news generates new money into the markets, there is a delayed effect. That effect is then further "priced in" or "over priced in" once the speculators start following the action.
So, in China, there have been news stories for months. Money finally found its way into the market and started leading. Speculators then drove the price up through the roof.