Here is the quote from imtesty's transcript of the AGM on October 31st, its the message to which I'm replying for those who want to go back and read the whole thing. 

While it doesn't appear CKD is the specific reason for wanting to embargo the data until the end of March I seem to recall subsequent posts (most likely from BDZ) speculating on a number of conferences around that time specific to nephrology.....going to start going through subsequent messages to verify. 

"We had some of our clinical steering committee members approached me this week and wanted to know if it would be ok if we stretched the embargo until a major meeting at the end of March next year. Anybody in favor of that? I certainly was not. I thought it was comical that they even asked, but whatever".