Such is the case with the inclusion of Lion Server in every copy of Lion! Just for starters, this means that every Mac running Lion will put Wiki Server at the user's fingertips, and very likely make the code behind it available to developers.
Just how much of the current, distinct server version will carry over to be included with Lion remains to be seen. Apple may decide to put some components representing large investments on the App Store, but they'll run on the stock version of Lion and be a cinch to install.
I can just see the ad now,
Mac OS X Lion, the world's most complete operating system.