Dear Mr 35,
Congrats on your interview. My advice (or 2 cents worth!) is that you should, by all means, attend your interview. It will allow you a chance to look physically at Dubai (and bring your wife/significant other, so she can also), and also gain a feel for EK itself throughout the interview process. But remember, the process is run by professional people who all have opinions: that they can't tell you. They have their instructions, and their responsibility is to the company primarily, not you.
So......... no matter what you are told during that process, keep the following in mind.
Should you decide to take the job, you should plan on minimum 5 years to command, do all your financial calculations for that 5 years based on your joining salary, and assume no increase in any benefit like education, housing etc. Also assume an annual inflation rate of 5-10%. To do otherwise will give rise to expectations that may not eventuate, and you will likely get dissappointed the first time an expectation is not met.
Your best chance of enjoying your time here is to set very low expectations on the T&C front, have your own life away from work, and consider any improvement a bonus. Do your time to achieve your own goals, and move on.
I am not being negative: it's a business decision, not an emotive one. You are the "business" in this equation and should assess your own marketability and income potential over your projected time in this "business". If you work out a direct comparison between EK and your present company, using the method above, then wherever the numbers point you will be making an informed decision.
Good Luck with whatever decision you make.
Regards,
CTOAN