Usually a change in model number of that type means there was some issue they fixed from the original version.
I was wondering this too. I am awaiting arrival from newegg as I post this, I do not know which is coming but I presume 1.0
In looking at gigabyte site I only noticed this difference between 1.0 and 1.1 and if anyone knows of another please do add :)
http://www.gigabyte.com/products/product-page.aspx?pid=4979#ov (rev 1.0)
http://www.gigabyte.com/products/product-page.aspx?pid=5102#ov (rev 1.1)
rev 1.1 shows
"Audio Noise Guard with LED path lighting" in overview
"LED trace path lighting illuminates to show the separation of the PCB layers." in overview
I have no idea why they would add this lighting. Just visual clear side panel eye-candy? maybe so in routing cables you could avoid area to lessen audio interference? Maybe I'll learn something when board actually arrives.
probably minor improvements have been made to components and also comes with the newest bios available at that time. Only the manufacturer would know specifics..
Why was this down voted? He is giving a good answer.