Games Workshop is moving the game rules forward with some changes in the new Edition of the Age of Sigmar coming next month, and is now starting up with some game mechanic previews. Up first is Turn Priority.
via the Warhammer Community
https://www.warhammer-community.com/2018/05/16/16th-may-rules-preview-turn-prioritygw-homepage-post-2/
In Warhammer Age of Sigmar, the game is split into battle rounds, and players roll at the beginning of each round to see who goes first. This means, in effect, a player may occasionally get to take two turns in a row (the last turn in one battle round and the first turn in the next battle round). However, doing so puts you at risk of the same thing happening to you later in the game! Mastering this system is one of the top skills a Warhammer Age of Sigmar player has to learn.
In the new edition, the studio have added an extra level of depth, choice and chance to this mechanic, as well as removing some of the randomness, to make for more tactical games.
Previously, players would roll off to determine who gets to decide who gets the first turn in each battle round, with the winner getting to choose. This works in much the same way in the new edition, but now, if the players get a draw, the player that went first in the previous battle round wins the roll.
In practice, this means that you’re somewhat less likely to get hit by a double turn, while if you do have priority, you’ll have a bit more control over when your opponent gets theirs. If you’ve just had a great turn, you might want to give your opponent priority to give yourself a chance to get a double turn later on in the game, for example.
There will be some other advantages to going second each battle round as well…