IST is an excellent transit airport however Id be worried from a connection point of view that it will need to be heavily advertised, cant see many thinking first line to want to use it for asian /eastern connections, unless pushed into it via Star or Expedia.
Looks like a definitie pre-empt for double daily GLA-DXB and launch of their First Suite on the route. Cant see EK losing any sleep over it however. Might suggest there is no pending Qatar ex Scotland, as their product would have had TK for breakfast.