I hope they do get an official release.
There are some good looking fan made unofficial Tonka Sisters available for fans who would like them, or for people who don’t want to wait any longer for a possible official release:
https://www.etsy.com/listing/609150460/custom-vintage-retro-star-wars-tonnika
http://jackoftradze.blogspot.com/2010/08/new-custom-tonnika-sisters.html
There is a whole range of other unofficial figures out there online which look to be reasonable quality and have the look of the official Kenner figures. I know some fans don’t like “repro”, but to my untrained eye they would seem to fit in with many fans’ official collections.