With the Tories breathing down the Beeb's neck at the moment, I doubt EastEnders will be offering any 1 million pound deals to anyone, let alone 15million.
It wouldn't surprise me to read the pay structures at shows like EastEnders are given a bit of an overhaul, to satisfy the licence fee payer. I read the other Coronation Street has introduced a three tier pay system, with Ken Barlow, Sally & Kevin Webster, Rita atc on 250,000 a year, and the then Kym Marsh and others on 100,000, with a lot of the younger, less established cast on 40,000 a year. This was said to be linked to bosses expecting a bit of a cast exodus, due to the pay measures.
If anything, EastEnders will probably have it's wage budget reduced or restructured to be more cost efficient. The days of big money contracts for the big names are gone.