I believe it's a 489 seat A380 that's being used - The service is going from two LD 77Ws pd to 1 LD 77W + 1 A380. So it's going from about 720 seats ewpd to about 850ish - about 135 extra seats ewpd on top of the capacity they've been operating at GLA for many years. As such I'm not sure it's really much of an unreasonable rise, I'm sure EK have increased capacity like this at many airports across their network - when the service sent from 1 to 2 daily many years ago that was a bigger jump in capacity and it seemed to go fine.
I guess EDI plays into it, but we'll have to see - notice QR ramping up frequency at EDI too, perhaps EK actions may be motivated to some extent by this.
Tonight is a 519 seat aircraft per EK The Source and 491 seat aircraft last night although I can't vouch for the accuracy.
Pete