The canon issue... it rears its head in every good license, from Middle-Earth to Star Trek. My argument always has been that at least in the Star Wars and Star Trek licenses, there really can't be a canon. Here's an example. Using whatever game system you like, try to come up with a detailed PnP campaign set in the Star Trek universe using the various TV series and movies as "canon" on which to build the universe. Start with two things 1. The map of the galaxy, and 2. Warpdrive technology.
Let me know how you do.
All the Star Trek series were made by giving out a reference guide to writers detailing the technologies and the themes. There was little to no fact checking in between episodes aside from MAJOR plotlines. The producers and writers were creating good (and sometimes stellar and sometimes lousy) television entertainment using a particular shared setting. Their goal was not to create a unified universe, they've said so themselves on many occasions. Trying to find a body of "canon" in this case amounts to mental masterbation in my opinion.
Contrast this with Middle-Earth, a single writer, a single focus, with the FULL INTENT on creating a unified universe from start to finish (google mythopoesis tolkien to see what I mean).
Now we come to Star Wars. It's a mix between the two previous examples. The expanded universe has a lot of different writers, yet there is still one "vision" in control. or is there?
A look at Lucas' "Vision"
Take one look at the first trilogy of movies and then see what is being done with the prequel trilogy and you'll come to the painful fact that if Lucas himself isn't even being consistent between his own movies, then there really can't be a canon.
That having been said, the Star Trek and Star Wars universes do such an incredible job at times of storytelling and engaging our imaginations that it's inevitable that fans will, in effect, create their own list of canon. That's fine, it just saddens me to see the furious debates and schisms that arise in the community all in the name of "official canon" when in fact the fans themselves care more about the consistency of the universe then the writers EVER did.
Sorry if it took me forever to get to the question, but my first reaction is, people shouldn't really care what's in the database cause I doubt Lucas does. The second reaction is that no, KotOR II should not be included in any canonical listings. Until the storyline is actually finished, the characters can't be considered canonical in any way.