It's really just Garbled Hints to confuse us.
But how about:
Gems and Handaxes: new resources and units coming with a standard expansion
Or:
Great Happenings: mini-expansion adding random events, golden ages, Georgia (Tamar!), Hungary, two more alternate leaders for Greece, George Washington for America, and at least three alternate leaders for England (and maybe France) named Henry.
A free Golden Horde scenario does seem most likely. G and H being the 7th and 8th letters of the alphabet also seems possibly significant.