Sensor range extender

No, they have not, but then they very seldom do announce what they are working on (and sometimes not even after they release it for sale :-)  SS2, which would benefit from it the most, has essentially 0 chance of one coming out.  That system is "obsolete" and it would be ludicrous to do any more development work on it.  SS3 is the current primary system, and the range extender is somewhat "built in".  I suppose it is possible they could bring one out in future, but my experience with SS indicates that it will never happen.