As I indicated earlier in this thread, there is a minimap fix over at the Widescreen Gaming Forums. I believe that there are files for both 16:9 and 16:10, so you'll want the one for 16:9 for 1920x1080.
Unlike KotOR1's static HUD, KotOR2's is dynamic and grows with the resolution. Unfortunately, Obsidian did not take widescreen aspect ratios and uber-high resolutions into account when designing it, so there's no real fix for the huge fugliness, aside from using hotkeys. It's not that bad, and you'll get used to it.
"Mind your wants, 'cause someone wants your mind."