Buy the rumor, sell the news.
The announcement was leaked a few days ago, the price pumped. Now things are just getting back to normal, nothing out of the ordinary here.
Price still went up in the past week.
Exactly. The news got leaked and the price increased in expectation of a price rise and when the time of announcement came, everyone started to sell to make profit of it brining the price of a coin down. So, it's really difficult to predict the price of coins that are just speculative and supposedly increases in price when the demand for the coin increases.