I was just on the phone with EK. Asked if or when they will allow miles upgrade to PE. The very nice gentleman told me it's possible. Then when I asked for the amount of miles for SIN-DXB he couldn't get me the answer. So it is coming very very soon...but not yet!
Just managed a JNB-MEL upgrade to Business for 59.7k... from time to time, Flex Plus can look like a bargain too!