Following up this article..[Reactor4] Back-up coolant system failed. Backup power is lost. 47 hours left.
Prof. Takeda [Link] estimates the coolant water of SFP4 will reache 100℃ in the evening of 7/5/2012.
Tepco was removing the upper part of reactor4 on 6/25/2012. [Link] He assumes it damaged the pipes of the coolant system.