Tarkir: Dragonstorm is here and there are a few excellent cards worth considering.
All of the new Tarkir swaps are replacing very similar cards (including the departing Overrun, which is still my favorite card ever).
The non-Tarkir swaps focus on two themes: Adding more board control cards with Behold the Unspeakable and Night Clubber and removing the clunky Persist combo cards. All in all, I think these changes will streamline relevant decks.