Title/OP still not updated so... BUMP! This is the latest news and the likely reason for the price rise.  

Summary (check link for details):
-Details of RC4's main feature, Darksend+, have been finalized and released. Over 99% anonymous based on the percentage chance of being exposed by a bad actor.
-RC4 code nearly finished and entering testing in the next few days.
-Code review by Kristov Atlas will soon begin.