yoursweatersux: From my understanding the game is a classic, and I've been wanting to play it for years. I'm surprised it's not on GOG.
Anybody know why, or if GOG has plans to acquire it?
Short answer: It's in LucasArts's vault and they're dicks.
Long answer: Licensing games is a long procedure, a deal has to be struck with the rights owner. Sometimes the rights owners don't show any interest in making a deal. Because they're dicks.
The game is a classic though and one of the most beautifully designed and written adventure games I've ever played.