Actually a custom battle teaser with only 2 factions, say Ayyubids and KOJ, would be an excellent way to get us hyped up before the big release, say a week before. Maybe something like 3 maps, a handful of mercenaries, 1 new soundtrack and the full rosters of both factions would be good. Most members of this forum are more familiar with the vanilla or western type factions, if they get to take the risk free trial they'll surely be interested in some of the more exotic factions BC has to offer.
Of course this would take time which is not in the best interests of anybody.
But of course we'll always have to stick to good ol' patience while the team carries out the last phases of the mod.