The 1200 screen cannot be rotated or inverted (the 1150 screen also cannot be rotated, only invert top & bottom -- the 1100 can handle all orientations)
The 1200 does with GEB librarian.
The 1200 uses an ethernet connection, so it should be absolutely no problem. Connect it to a router / hub and you're ready to go.
Overall, I like the 1100/1150 better, as it is more rugged and easy to carry around. The 1200 is a bit fragile and heavy, and also has some minor "flicker" due to the color screen. However, it DOES have a bigger screen and resolution ... if you're happy with your 1150, don't upgrade to the 1200. Think of upgrading to the e-ink models.
The battery life is around 9-10 hrs, but that depends on who you get it from and what is the battery condition.