At this time we have not made any plans to update to the V3 API.
Googles deprecation policy will support the V2 API for a period of three years.
The V2 code can run using the V2API as well.
to change it to use the V#API, you can change the v attribute of the script tag that calls the google server:
<script type="text/javascript" src="http://maps.google.com/maps?file=api&v=2&key=ABQIAAAAvZMU4-DFRYtw1UlTj_zc6hT2yXp_ZAY8_ufC3CFXhHIE1NvwkxQcT1h-VA8wQL5JBdsM5JWeJpukvw">/*wagmp*/</script>
to v=3:
<script type="text/javascript" src="http://maps.google.com/maps?file=api&v=3&key=ABQIAAAAvZMU4-DFRYtw1UlTj_zc6hT2yXp_ZAY8_ufC3CFXhHIE1NvwkxQcT1h-VA8wQL5JBdsM5JWeJpukvw">/*wagmp*/</script>