It seems there’s bad news for all Orange customers. According to their press release they’ll be scrapping all their old tarriffs at the start of October, and introducing a new set that on the face of it seem significantly more expensive.
I believe the only good news is that current Orange customers can keep their tariffs (i.e. Everyday 50, which is alas absent from the new tariffs) for the time being, although even that is not certain. Check this uk.telecom.mobile thread for more information. I guess it might be time for another mass migration then…