I don't know if anyone else has done this, but I tried looking at the mini-maps to see if they revealed the colour schemes of any of the new civilisations, but apart from the Celts (who are quite clearly shown to have bluish-green + light blue), it seems that 2k/Firaxis didn't slip up and reveal any more new ones. Shame, it might have generated some interesting speculation as to who they might belong to.
If anyone wants to double-check, screenshots 4 and 6 appear to show: Persia, the Celts, France, Egypt, Babylon and Spain, while screenshot 5 just shows the Celts and Germany.