While i have yet to encounter the end game issues that many other people mentioned above (due to the fact that I am leveling my first toon), I really am not looking forward to that.
However, I will say that I love this game. I love Star Wars. I love KOTOR (present tense, because it is still my favorite game of all time). So don't screw this up, Bioware. The amount of people you will be letting down if you do is probably orders of magnitude greater than what you think.
A few things I would like to see addressed are:
1. New playable races. (Nautolans people, we need Nautolans. You already have the models in game. Also, FYI, I'm fairly certain that most species in the Star Wars universe can learn galactic basic a.k.a English)
2. Guild ships. (or space stations, just something that members can dock with)
3. Player storylines extended at end game, or maybe a merging of stories into high level content.
4. Issues mentioned above, et al.