The resumption of trading for Bluebird Bio could lead to increased volatility as investors react to the news. However, without additional context regarding the reason for the halt, it's challenging to predict the direction of the stock price movement. The news is highly relevant as it directly affects the stock's availability for trading, and it's quite important for investors who hold or intend to trade BLUE shares. The confidence level is high, but not absolute, due to the lack of information on the circumstances surrounding the trading halt.