Web 2.0 isn't "coming out", it has already been out in many different forms for a while now.
Quote Originally Posted by Wikipedia
The term "Web 2.0" refers to what some people see as a second phase of development of the World Wide Web, including its architecture and its applications.

Many recently developed concepts and technologies are seen as contributing to Web 2.0, including weblogs, linklogs, wikis, podcasts, RSS feeds and other forms of many to many publishing; social software, web APIs, web standards, online web services, Ajax, and others.
It's less of a standard and more of a methodology.

This forum and site even use some of the web 2.0 principles. (Ajax, XHTML standards compliance, wiki, and RSS feeds.)