haven't had the Aldi one, but had the Lidl one, which is a very similar scheme
and they are very keen on moving you to different regions very often, and also you have to be prepared to work 60/65 hour weeks. These schemes are very hard work, but I suppose that reflects the starting salary, which is double the standard graduate starting salary.
again that was for Lidl, but i imagine Aldi is similar...so don't start saying what region you'd prefer to be based in (unless asked of course!) and try and sound as flexible as possible.