I'm flying for Emirates and just flew with a guy who is pretty much in the loop of what is happening in the hiring process here. His guess was that about 60-70% of people interviewing are getting the job, although I don't know if his guess includes DEC candidates or not. Language skills seem to be a big issue at the moment.

I interviewed at Emirates about a year and a half ago and I don't think the process has changed much since then. To properly prepare I think "Ace the Technical Pilot Interview" is still the book to read. Yes- there are some errors in it but I think it is still the single best source of info. Another one that might help is a British publication called "Understanding Performance" by AJ Walters. This book was recommended to me by typhoonpilot and I found it helpful. The book does a decent job of describing performance issues common in British ATP testing but not covered at all in the FAA world. When I was invited for the EK interview I had been half heartedly reading 'Handling the Big Jets' for a Cathay interview that never came and I found the book excellent, but probably more in depth than required for the Emirates interview. I'd recommend it if you have the time, but if pressed the "Ace" book is pretty good for one stop shopping. I actually read most of "Ace" during my airline flight over to DXB and felt I did fairly well on the written exam. Good luck!