At around 07.11.2020, 16:30 UTC (one and half hours ago), it seems like many news outlets in the US decided to call the 2020 presidential election for Biden, which prompted celebration, congratulations, and so on. This seems to root on the Associated Press and Edison Research deciding that a win for Biden now surpassed some magical threshold of certainty, in particular due to the projection that Biden won Pennsylvania (which would give him sufficient votes in the electoral college). So far, I get this.
But what new data caused this change? Again, going by many major news outlets, the situation in Pennsylvania looks pretty much the same as 24 hours earlier, with about 5% of the votes left to be counted and Biden having a lead of 0.5 percentage points or about 30.000 votes on Trump. None of the reports I have seen so far mention data about another bunch of votes coming in or similar. So this seems to come pretty much out of the blue (at least on a short time scale).