What was speculated in the previous update seems to have come true. The #3 reactor exploded earlier today.
The explosion itself was visible much larger than the explosion that occurred two days ago. As of now, they are saying there is no damage to the core of the reactor, which means there is no threat of a large scale spread of radiation.
Three hours since the explosion, there is still limited information on what happened and what could happen. As of now, 6 workers at the plant were injured, and they are asking once again for immediate evacuation in the 20km radius surrounding the reactor.
For everyone else, they're saying there is no immediate threat.