The rumours and stories surrounding a Ukraine state grain board continue to circulate. I have yet to read or hear an opinion or argument in favour of the idea although no one was in favour of the export ban and that still went ahead.
Richard Ferguson from Renaissance Capital writes a concise argument (here) of why a state grain board and the continued government intervention in agriculture in general is a bad idea.
Unfortunately just because it's a bad idea doesn't mean it's not going to happen.