We have a few ideas still that could allow them to be available while leveling, but each of them have sticking points that would require their own solutions. One is expanding sets out so that it isn't just one item in each slot, but a group of items all separated by level requirement. So there could be, say, five pairs of pants that all work as part of the set and are each better than the last. While leveling you could be wearing the first pair of pants and then find a new and better pair that still work to benefit your set bonus. That isn't without its problems though.

Anyway, sets are actually in the game right now in very limited forms, there's a bit of design left on them yet, but as I said they work very well at end-game and that's where we're leaning toward them appearing. </blue>