first off the GLA transatlantic service will be served by a 767-400 for the summer.
With regards to EDI, continental are expected to start a service next summer, operating a 757 to Newark. This service was in discussion pre- september 11th with the aim of starting service this summer, but due to the events of the day, discussions were abandoned. These discussions are continuing again, and an announcement will hopefully be made soon confirming the route.
BMi have been talking about EDI flights for ages, but so far there doesnt seem to be much hope of seeing thier A330s flying out of here...