Hey there. First off, this isn't exactly the right place to put a thread like this. Something like this should go into Holowan.
And anyways, in answer to your query, there are a few psuedo-KOTOR 3 mods in the works.
The only completed one (or mostly completed) one is Trex's The Jedi Masters
. The beta for it can be downloaded here
And the other major one is logan23's Revenge of Revan
. You can download the beta here
Neither mod is complete. Revenge of Revan still has a few years to go, and Trex is ironing out the fine details of The Jedi Masters. Although we have yet to see a 'true' KOTOR III mod based on the book, these are as close as it can get for the moment.