I think the news was just coincidence, it was never announced, just displayed as a concept. It will definitely not appear with the Fiesta in it's current form, but who knows what the future holds in a couple of years time when the refresh is released. I for one would consider it still to be massively unlikely but you can never say never...
TeamRS are working with dealers to bring the 'RS accredited dealer' back, they are also looking into the supplying of RS stylie upgrades. For what models though and what upgrades remains to be seen. As does whether it ever happens. Lots of talk, not (so far) so good at the walk...