It's unlikely to happen. I hope that I am wrong, but looking back to the Betas the trend has been toward reducing the importance of leveling up as opposed to increasing it.
For example, the level up bonus for HPs got reduced, some of the armor level bonuses are gone as well, and the grave elementals and butchermen's numbers have been reduced. And the latest - the lightning pike, one of the few weapons that actually gave a bonus for veterans got nerfed. The developers do not want troop levels to matter too much, so they are bumping off anything that benefits from levels. The champion lance, acrobat, lightning hammers? I have little hope they'll remain unchanged for long.
I think it is a terrible idea, and the main reason summoners are so bad after the early game.