I think you should wait for GIM version 8.1, because there is no migration procedure for GIM DB at present. As i heard in GU, at next version 8.1 it will.
Hmm, no migration procedure…
How do they expect customers with existing data to use it! I guess that it would be possible to run it as a brand new database as long as the business can get data from both 7.6 GIM and 8 GIM until the point that the 7.6 instance can be retired