Crosmando: I would bet it was on EA's end
sure, everything must be EA's fault, right? i mean, EA couldn't possibly be interested in putting these games up on sale ASAP. and look how greedy they've been! $5.99 for each game?!? and almost no extras to go with the games.
oh, wait... EA is probably the best publisher currently on GOG. all their games are for sale at the lowest price point and most of the games come with a ton of extras. and that's not even taking into account the stellar quality of their GOG catalogue.
IMO it's much more realistic to think GOG is keeping these games back in order to have a new Good Old Game to be released every Tuesday and Thursday.
as for Pharaoh, just buy the complete edition (including Cleopatra) from Sold Out Software on Ebay or your local game store. same with Zeus and Empire: Rise of the Middle Kingdom. if you want all 4 (not to mention Caesar 4, too) you'll wait forever for them to show up on GOG.