Change Mgmt in Scrum
Below is a link to a short paper discussing how change might be managed at a large firm using Scrum.
Feel free to modify to suit your situation.
Not all firms would do it this way, and this might be deemed a transition step from Waterfall to other practices. Or, if your industry is somewhat regulated (eg, Sarbox), you might stick with this.
Hope it helps.
Agile Coach, MBA, CST
Kitty Hawk Consulting, Inc.
Blog: Agile & Business (Google that)