Major change is that there is going to be a 3rd city soon so the interface was slightly changed when accessing the city button. You can now scroll to the right to scroll through your cities. This means that if you are on your second city you will need to scroll to the RIGHT in order to access your main city. I thought this probably wasn't the best option but I guess they're going for uniformity on this.
Also on the city button are the teleport options.
Tactical teleport allows you to choose where you will teleport to.
Tactical retreat allows you to teleport anywhere randomly.
It seems that players with alternate accounts are now able to move all their bases in the same place and dominate a certain area. I'm hoping this doesn't disrupt the balance of the game. I can see how it's going to affect new players and those who don't have alternate accounts. If you're thinking of making an alt account soon would be very helpful to you.
Another thing to note - When you're on the 'Slaves' Menu for any resource building you can now see the raw amount of resources you will be earning from the amount of slaves in the building. This number doesn't reflect any bonuses that you have. If you want to see the total amount of resources you will have to tap on the actual resource bar. Yeah it doesn't look tappable. It is. I didn't know either.