Compared with 2.11.8:
The Draft explains its advice. Above the cards in the pack, a «Why» box says in a few words why MOX recommends that card, which alternative is just as good, and why the card with the highest percentage is ranked lower. Hover over a card to see how its score adds up: card strength, your deck and bonus. When you look at your deck, «Deck choices» explains the strong cards left out, the colours added and the lands adjusted; the same lines also go into the deck file.
More precise deck lands. The suggested deck counts mana symbols better, hybrid cards included, when it decides how many lands of each colour to play.
Draft statistics from the MOX server. MOX no longer asks 17Lands for data directly: it gets it from the MOX server. If recent data is missing it uses the 17Lands public data, and if that is missing too it advises by colour and curve. The Draft header always says where the data comes from.
If you have MOX 2.11.8, the update arrives automatically.