Remember what I have been saying over the past month and before that:
The forward movement in the PD dates for some countries was based on the fact that there were not many that had completed files before then and that is how they are going to assign visas at this time.
If one has a current PD date, but only approval on the I-140, it is going to be quite difficult to get a visa at this time if the DS-230, original one was never approved.
So to be able to use up the visas and clear up pending files, they go onto the next person. There is still only a limited number of visas that are even available to begin with. Suspect that things may move backwards and not forwards when some of those with older dates get their files complete.
You can pretty much figure that these are the going to be the current dates for June as it was released by the US Embassy there with information that they get from the US State Dept. They were correct last month as well, and there were no changes made to it.
Best of luck to those that are waiting.