Lyndsay (by way of Dave_C who asked her) said she thought there would be no change in terms of earning or MFU eligibility but that it was not yet 100% confirmed and she was looking in to it. That's the last news I saw and I guess (hope) she will eventually be able to confirm that for sure once they go on sale. (Annoyingly, way back when the EC pages used to list what each BA booking class earned like they do for the partner airlines but I can't find this at all now).