Driving attack: attack roll and Athletics contest, on a success you and the target move up to 15 feet in the same direction if the creature is the same size or smaller than you.
Guarded attack: attack roll with disadvantage but the next creature to attack you also has disadvantage.
Lunging attack: Increase your reach by 5 feet but you make the roll with disadvantage. Next attack roll has advantage on attack rolls against you.
Shifting attack: attack with disadvantage, on a success your movement does not trigger AOO by the creature you’ve hit.
Unbalancing attack: attack with disadvantage , if the creature is your size or smaller it must succeed on a DEX save (8+prof+STR) or fall prone.
Called shots: disadvantage and give 3 AC to target. Add 3 extra die of damage if you succeed
staggering shot: give 2 AC to target, if creature is large or smaller and you hit it, it must succeed on a STR save (8+prof+DEX) or have its speed reduced to half until the end of its next turn.
These are subject to change.
There is a UA about this