tweens/tween rotation

 var game = new Phaser.Game(800, 600, Phaser.CANVAS, 'phaser-example', { preload: preload, create: create });

function preload() {

    game.load.image('arrow', 'assets/sprites/longarrow-white.png');
    game.load.image('lemming', 'assets/sprites/lemming.png');

}

var arrow;
var arrow2;
var lemming;

function create() {

    game.stage.backgroundColor = '#00aeef';

    arrow2 = game.add.sprite(game.world.centerX, game.world.centerY, 'arrow');
    arrow2.anchor.set(0, 0.5);
    arrow2.tint = 0x000044;
    arrow2.alpha = 0.5;

    arrow = game.add.sprite(game.world.centerX, game.world.centerY, 'arrow');
    arrow.anchor.set(0, 0.5);

    lemming = game.add.sprite(game.world.randomX, game.world.randomY, 'lemming');
    lemming.anchor.set(0.5);

    setNewLocation();

    game.input.onDown.add(setNewLocation, this);

}

function setNewLocation () {

    arrow2.angle = arrow.angle;

    lemming.x = game.world.randomX;
    lemming.y = game.world.randomY;

    var angleTo = Phaser.Math.radToDeg(arrow.position.angle(lemming.position));

    var shortestAngle = game.math.getShortestAngle(angleTo, arrow.angle);

    var newAngle = arrow.angle - shortestAngle;

    var time = Math.abs(shortestAngle) * 10;

    game.add.tween(arrow).to({ angle: newAngle }, time, 'Linear', true);

}