Why do people seem to think that second slot can be unlocked for free? I expect it to cost real cash like the estate, $50 is my guess.
Now I'm afraid that u r right
The only way to unlock second slot would be library - some research chapter 6, but they didn't say anything about library in the last notes.
Mansa Musa capstone research will be minus 1 citizen for gold researches at uni.
So the only way to unlock second slot will be money or crowns through the shop
If money, then we will have another issue on forum like with mansion and we lose more players. If crowns - probably it will not be cheap as well so...