Take this for what it's worth -- and in Jefferson's case, it might not be worth much -- but his high school coach now says Jefferson will sign "by next Wednesday":
http://www.allkyhoops.com/2012/05/co...decide-by.html
Pretty sure Wednesday is the end of the spring signing period, although it's not really a deadline -- a kid can sign a non-binding instititional letter at any point up until the start of classes.