The tail fan demonstrator is not being developed for use on the 407.
It is one of several technologies (including a new rotor and possibly a new engine) being evaluated for Bell's future family of helicopters, MAPL.
The base 407 helicopter is being used as test bed for these technologies, as it gives a good known point for comparison.
As with all of these technologies, if it is successful enough and there is customer demand for it, there is a possibility that they may be retrofitted to existing aircraft or new model upgrades in the pipeline, such as the 427i.