On Yahoo!'s Q3 Earnings call today, it was announced that we intend to transition Yahoo! 360 to a more integrated Yahoo! experience in early 2008.
...
Many of you have asked if Mash, Yahoo!'s experimental profile service, will replace Yahoo! 360. We know this is an important question for many of you, and even more so given this news. We don't have all the answers today, but we are testing solutions, including Mash, in order to provide a more integrated universal Yahoo! profile throughout the Yahoo! network.

Yahoo 360 Transition [blog.360.yahoo.com]