Like Modern Horizons, this set introduces new cards into Modern and other eternal formats without them ever being legal in Standard. It is expected to bring a host of powerful new toolbox cards, strong themes to try out, and several throwbacks.
This time around, Wizards of the Coast promised a higher power level and greater complexity with even more of what players loved in Modern Horizons. Modern Horizons 2 includes special frame treatments (that they're not ready to talk about just yet) and a full range of products for all players to enjoy, including Set Boosters and Collector Boosters. All five enemy colored fetch lands may appear at rare in regular Draft Boosters of the set. [source]