I have taken a job in the past where the wage rise in a 3 month period after completing training, has been guaranteed in writing, so I knew where I stood. In your case if a review is offered, you could ask for a committment in writing i.e. that if you achieve certain targets, you will be guaranteed the wage rise. If they refuse this, then be suspicious!
I cannot believe that they would have no idea about what they are willing to pay someone, so once again you should not expect to get a vague answer.
I would be confident about what you are looking for as a wage, especially if you know that you are worth the wage you are seeking!
Best of luck with the interview!