Actually, if you provide a default or default_cb as array on a repeatable field will result that this field will get initialized with the correct number of fields as array

A text field setup like:

	$cmb_demo->add_field( array(
		'name'         => __( 'Test', 'cmb2' ),
		 'type'          => 'text',
		'repeatable' => true,
		'default'       => array('Text 1','Text 2','Text 3'),
	) );

Actually results on a repeatable text field with 3 inputs (one for each array value) which is an awesome feature to have

On issue #1285 I was described that with this current ability I initiate a colorpicker field with a set of values but there is just one issue

Each field is created with each array value, what is ok, but the empty field (the last that CMB2 uses as pattern to duplicate) receives the full array as value

My proposal, if value given as default or default_cb is an array and field is repeatable, for the empty field pass an empty value instead of the array to avoid issue as described on #1285