By taking ICANN under its wing? If you read the report you'll see that it's not the UN's idea - so why would they have a plan yet?
Besides, as the report further notes, ICANN is seen as being too much subject to United States political whim.
The UN's own take on the whole thing (which pretty much sums up its involvement) is here. By following a couple more links you can get the report from the relevant working group (consisting of these people who I guess are not the sort of people who would have any idea about the Internet); you can get lists of the organisations who plan to attend the summit (which will be held in November); the list of those who attended the preparatory meeting reported on runs to fifty six pages and includes representatives from the International Telecommunications Association, EPIC, Cisco, CERT, Alcatel, ICANN, and Intel (no, they wouldn't know anything about the Internet either). The FSF plans on being at the summit, too.
Gee, and I found all that out without leaving my seat. Ain't the Internet grand?