So far, the Imperial City, Orsinium, Morrowind, and the Summerset isle have gotten Online expansions where therse locations are either explorable, or expanded upon. Now suppose we finally see a land that barely gets any attention in Elder Scrolls. Elsweyr. I even have an idea for a plot.
With the Thrasian Plague now cured, the Daedric Princes Namira and Peryite believe that the Khajiit people have grown weaker. Namira has viewed the Khajiit as the most pitiful race and Tamriel, and what better gift is there to be pitied? Not only that, but her realm of Oblivion, the Scuttling Void is also the Khajiit hell where Khajiit who have not followed the path of the moons go when they die. Peryite on the other hand is upset because the High Elves helped to cure the plague instead of the Khajiit getting through it themselves and becomming stronger.
The two hatch a plan to "make the Khajiit more powerful" via spreading another plague upon Elsweyr. However, unbeknowist to Peryite, Namira is planning on increasing the plague they create to be on a more cosmic scale, and place it into the Sands Behind the Stars, the Khajiit heaven. This cosmic plague will infect every deceased Khajiit soul and cause them to be banished to the Scuttling Void to be pitied forever. But Kynereth, who guides all Khajiit souls to the Sands Behind the Stars when they die refuses to abandon a race she gives comfort to upon their deaths and in he own mysterious ways, sends the Vestige to stop Namira. The fate of an entire race is in your hands, for if you fail, the Khajiit will not only become an all infected race, but a damned race as well.
Travel across the deserts and rainforests of Elsweyr, cure the sick, rescue Khajiit souls, and uncover the mysterious and history of the mysterious land of Elsweyr, and stop Namiram before every Khajiit who lives and will live will be doomed to disease and pity in this life and the next.