Following up on a request made earlier in the CWG-Stewardship's work, the Transition to Successor plan called for at C.7.3 of the IANA Functions Contract has been published at http://www.iana.org/about/framework (attached as PDF here).

It was also the subject of a DIDP Request, which can be reviewed here: https://www.icann.org/resources/pages/20150120-1-2015-02-24-en.