That is what happened with coarrays (which was called F-- before), the object-oriented features, however, were not based on existing extensions. For example, neither the Intel compiler, gfortran, nor g95 supported any of those features at the time of the article's writing, and the NAG compiler provided only partial support[0].
[0] http://portalparts.acm.org/1280000/1279941/fm/frontmatter.pd...