In relation to your request we created the following article
where we provide instructions for upgrading the TeamPulse process template. The instructions follow mainly the steps provided by MSDN, but with focus on the specifics of the TeamPulse template, adding some issues that we found during testing the upgrade.
In the article you can also find a file with the already updated process template - you can use it to directly update your TFS template without editing it yourself (if you haven't made any customizations to the original process template).
Saving a copy of your current process template before upgrading is recommended.
Let us know if you have any feedback on the article or if you need some further assistance.