What about the Khajiit terrorist organisation operating in Leyawiin ?? Why haven't we heard anything more on them.
Why would we have? They were an organization that concerned itself only with one city in the imperial province, not even that important a city. The only places where they would be relevant would be in Cyrodiil or Elsweyr and after the great war and the conquering of Leyawiin by Altmer, the splitting of Elsweyr into two different nations it just seems irrelevant.
To make it even worse, consider other things we have heard little about. The destruction that took place in Morrowind, the possible destruction of one or more great houses. The religion changes Morrowind must have gone through, the death of the Tribunal, the Mede line of Emperors, the aftermath of the Oblivion crisis and the cost of rebuilding the Empire, the pillaging not even that long ago of one of the most important cities along the Illiac Bay, the civil war in Hammerfall, etc.
Let's face it, Skyrim is pretty much looking towards Skyrim first and second. The rest of Tamriel can be damned and if even a little information comes through we should be happy about it, no reason to expect people to really concern themselves with Leyawiin.