Could the page clarify what the feature actually implements? The majority of the packages provided have been in Fedora since F10.
The release notes should also be cleared up somewhat - Gnustep isn't "the open source version of nextstep", it's "an open source implementation of nextstep".
I think one issue is, that the majority believe, that gnustep-base will fullfill the implementation of the GNUstep API. In opposite, this package implements only the foundation frameworks which provides classes likes NSString or NSDictionary. This are non-GUI classes which will be required by other gnustep packages like gnustep-gui which will implements the classes of the AppKIT framework, which you need to create GUI applications on the base of GNUstep.
For the GNUstep core collection we need the following packages:
On top of this package collection you can create addtionaly packages based on the GNUstep API.