Hmm where can i start?
I never had a G1 but i am one of the beta testers og the G2.
The G2 will have everything that the G1 has and then much more.
The G2 can be connected via lan, serial and usb.
The software is still in development but very functional for both visual and imaging.
See this site for more info
http://www.gemini-2.com/