As Roadmap says, WordPress 3.0 Coming on March. If everything on plan it will be merged with WordPress MU, that means we could install multiple blog on single install.
Currently if you want to expand your reach by adding multiple sites on your normal WordPress installation, you will have to install a new copy of each time. But after the release of WordPress 3.0, that expansion will be much easier.
Since WordPress is an open source platform running by many developers out there, you may also put your request for new features in a thread opened by WordPress Team. Here is the link for the same,
WordPress 3.0 New Feature Request
But now its feature freeze, that means now only planned featured will be added, more feature will come on later version.
















