The other change that goes with it, though, is that now magic items have rarities. Common items never have daily powers. Uncommon and rare items do, but you can't buy them or craft them. You only get access to uncommon or rare items if the DM decides to include them as treasure, or if maybe you go on a mini-adventure to find a special merchant who has one specific item you're looking for, or go on an adventure to acquire special magic item components so you can craft one.
I believe the new DM's Kit gives a guideline that PCs should only have 2 or 3 uncommon or rare items.
So you can use all the daily magic item powers you want . . . but usually you'll only have 2 or 3. And you can't just go out and buy tons of extra ones.