Changing Way

WordPress 3.0 is a major release due to features such as multisite networks, custom post types, a new default theme, and menu management options.

That said, I’m hoping that you’ll be able to upgrade to it without noticing much difference. To refer back to the four features mentioned above:

• Multisite, and hence the Super Admin stuff, is off by default, with edits to files such as wp-config required to turn it on.
• Custom post types appear as an option right at the foot of the admin menu sidebar, so they don’t get in the way, and might remain unnoticed.
• The new default theme applies to new blogs/sites, so you won’t see it if you’re just upgrading an existing install.
• Menu management, like custom post types, isn’t an obtrusive part of the admin interface.

It seems as though you’ll be able to upgrade to 3.0 without bumping into the new stuff, unless you want to. Put another way, WordPress 3.0 will let you shoot yourself in the foot, but you’ll have to take explicit steps to load the guns.