As of May 7, 2014, 814 fuel assemblies (22 new (unused) assemblies, 792 used fuel assemblies) out of the total 1533 in the Reactor 4 Spent Fuel Pool have been successfully removed.
Removal of the fuel assemblies in Reactor 4's SFP started on November 18, 2013. At this pace, it will be completed sometime in November this year, as scheduled.
From TEPCO's English page on Reactor 4's SFP fuel assembly removal (which has been updated finally, to my surprise):
This job seems to be about the only one job at Fukushima I Nuclear Power Plant these days that is carried out without a major glitch or accident, though with a significant radiation exposure to the workers who manipulate the Fuel Handling Machine on the platform above the pool to remove the fuel assemblies. The bulk of radiation comes not from radioactive cesium but cobalt-60 in the water, according to Nuclear Regulation Authority.