The "promised" Winklevoss ETF and other bullish events are priced in already.
Only, and still only ideally, for the people who follow this stuff. Not for the potential investors who haven't heard that news yet (or regarding any other investment-prompting news that hasn't been fully disseminated). Such stuff simply can't be priced in, meaning whatever the necessary combination of news reaching the big wigs' ears will cause a large influx of funds. Many of these people don't even know what bitcoins are yet, so the current price can't represent the price it would be hovering around if they finally heard this news, understood the implications of it, and were motivated enough to invest.
Furthermore, people who ARE invested in bitcoins may not know about any particular piece of news or its full ramifications, meaning that from that angle, too, there can be news that isn't "priced in".
If this was closer to an efficient market like sports betting where the magnitude of the new money coming in was more predictable, and the information being used to cause this new money to come in was more widely disseminated, then you might have a point, but we're nowhere near that point, in my opinion.
