Takes some searching, but sure.
Chaos Storm
...
Effect: You teleport each target hit by the attack so that it swaps positions with another target hit by the attack.
I'm pretty sure there are others. Basically, if you want to have something that looks at everything you hit (or missed), it has to be an effect.
And for an example that more or less exactly matches my initial example:
Acrobat's Blade Trick
You flip into a spinning acrobatic display of flashing blades. Then the display transforms into a deadly attack.
Encounter
Standard Action Close burst 1
Prerequisite: You must be trained in Acrobatics.
Requirement: You must be wielding a light blade.
Target: Each enemy in the burst you can see
Attack: Dexterity vs. AC
Hit: 1[W] + Dexterity modifier damage
Effect: After the attack, you can shift a number of squares equal to the number of enemies you hit with this attack. During the shift, you can move through squares occupied by enemies you hit with this attack.
