Some people have been expecting a ~May-June rise for months [1]. If you look at a log plot, and believe that the future has something to do with the past, this conclusion has some legs. News articles like this will tend to drive the hype again, repeating the cycle, perhaps with smaller amplitude.
If enough people believe it to be true, it will happen, at least temporarily.
If enough people believe it to be true, it will happen, at least temporarily.
[1] http://www.cryptocoinsnews.com/news/bitcoin-price-2014/2013/...