Any one knows why?
why a new Xcode released today?
It's the Mac App Store public release version to replace the recent GM Seed from last week...gets everyone on the same update scheme, apparently.
To add on to KMT's post, the GM was only available to developers. The new version in the app store makes the 7 available for anyone. Xcode versions always update with new iOS or osX releases.
The build number is different