Well I am not really pleased myself to be honest. As mentioned before, it really seems a lot like copy and paste again. I don't mind repeating a new system for two or max three times, like the harbors (minus the complete overload in OF) or the colonies, but four is too much in a row.
When it comes to the GB, I am not completely uninterested to be honest. I like that there is a new idea to help out in the later half/third of the game. It now depends on how much it really helps in terms of number of usage and percentage. If it's like a second Blue Galaxy for special goods, it is of course not for everyone, but it would show potential. I find myself using the colonies most frequent in the start of a new era, to gather the masses of goods and help guild members with building the GB themselves or to sell it for a rather high price. The limitation is the amount of special good you can collect in a day on the map without diamonds. A useful amount of times you can double a special good collection would boost this production/amount you can put in the research. In this case it could be of interest for a good amount of players. So I really hope it starts soon and let's wait for the next few days for the first to push this building up. If it is decent, I will build it.