We have a website in joomla - http://www.michaeladeery.com/ its in 1.5 version.
Now We create a new joomla template in 2.5 version. Here it is :http://review4client.com/city_wide/
We need to integrate this 2.5 template in to existing. all content integration need to be done. All used modules need to port over it. Also some minor functionality you can make a difference between existing and latest.