Well this is interesting...
I called FB to ask for old classic award inventory on a AMS - BON trip beginning of july. Before the change there were a few dates still for 50k miles and now they turned into the 62,5K miles option.
When asked on NON of those dates the old classic award was available. Since the 62,5K option is the cheapest option now, you would think that this constitutes the old 50K option.
Anyone else had this same experience. I wasn't able to get any 50k option over the phone for the whole month!