There have been many manufacturers working on their own OS's. The big headlines last year were "OMG samsung is dropping android for tizen"

. Its likely the OS will only be a player in developing markets that don't currently have access to the play store.
Ultimately, nobody is going to use an ecosystem without strong application support, and no dev wants to create an app for a system that nobody uses. Its interesting that Samsung is delaying the release until it gets more apps.