My site is merging with my friends one so the domain and the site title will change, currently my page title's are structured
<title>Contact Us | Example Industries</title>
But when we change the name of the company I was thinking of changing it to
<title>Contact Us | Cool New Site Name</title>
I have a sitemap.xml file which I can add in Google Webmaster Tools to reindex my pages, but is there anything I need to be aware of when changing names, should I still reference the old name initially maybe in the title or meta description. What is the best approach here?