Yeah the book you retrieve for the Dunmer Brand-Shei in Riften, pretty much states that the An-Xileel wiped out House Telvanni (sp?) who I believe was one of the Great Houses that was the biggest player in the Slave Trade in Morrowind. With that I think their revenge was complete. House Redoran seems to be in charge now and they seem rather open minded so maybe there is a chance of that happening.
But at the same time the Khajiit suffered alot in the slave trade as well, they also suffer at the hands of the Aldmeri and they suffered by the Empire to. If Elsweyr ever becomes strong again, I fear that alot of factions are really going to suffer it's wrath, because I nevwer pegged khajiit as being the type to forgive and forget.