That is an aloe, but you are right, you will need to see the flower to know which species it is. I like the lovely dark green. It is not an aloe I know offhand.
It's nice to know someone who might know. Once it flowers I'll post another picture. The problem of lack of identification here is that I found a discarde plant section and rooted it. The garden centres around this area often have poor lables with just the generic term for a plant species too!