I really, really, really hope that they continue with the trend of not assigning any prices to magical items and use the same philosophy in the DMG. I also really, really, really hope that if they have a magical item creation system, that's it's heavily restrictive in a way that makes creating magical items something more than just, "My character spends a few weeks doing this, now he has a +5 uber-munchkinator-of-doom'eth."
Personally I'd like to see some sort of system designed around questing for rare components. Or perhaps even spontaneous magical item creation, like, "Oh, you just crit the dragon for exactly enough hit points to bring it to 0 while you'd dodged for three rounds on 1 hit point and now you can stabilise the three party members on their last death save! Your sword is now a dragonslaying sword +1!"