GNUstep as a desktop environment has definitely not gotten the work it needs (the core of the desktop experience, GWorkspace, just got its first official maintainer in years), but the core has been fairly well maintained. They've got pretty much complete support for Obj-C 2.0 features and LLVM clang in a runtime that was written from scratch, and the whole thing is cross-platform (including Windows support).
To me, the most interesting aspect of this is that Sony did all this without communicating with the GNUstep community. We don't yet have a clue what the extent of their changes are, or what components were used or not used, so it's impossible to say whether Sony's work can directly benefit GNUstep.
To me, the most interesting aspect of this is that Sony did all this without communicating with the GNUstep community. We don't yet have a clue what the extent of their changes are, or what components were used or not used, so it's impossible to say whether Sony's work can directly benefit GNUstep.