Our first official look is on the 25th:
https://twitter.com/maro254/status/1...546678784?s=19
But a few leaks have surfaced:
DFC land/creatures where you choose as you play them instead of transforming them.
And landfall GB Nissa
https://images.app.goo.gl/TzA3ooLpozqTRFfRA
Landfall: add a loyalty
+1: One of your lands becomes a 3/3 menace haste until eot
-5: drop a creature into play with a cmc less than your land count. Add 2 +1/+1 counters