Looks like the degree will not contain the word "online". From the FAQ:
> How will this degree appear on my diploma and/or transcript?
The name "Online Master of Science" is an informal designation to help both Georgia Tech and prospective students distinguish the delivery method of the OMS program from our on-campus degree. The degree name in both cases is Master of Science in Computer Science.
> How will this degree appear on my diploma and/or transcript? The name "Online Master of Science" is an informal designation to help both Georgia Tech and prospective students distinguish the delivery method of the OMS program from our on-campus degree. The degree name in both cases is Master of Science in Computer Science.
http://www.omscs.gatech.edu/faq/