So the demo is out, where you can play the tutorial, and one mission with a lot of options left out.
Looks a bit better than 3 (but not by much), has a few added buildings, the UI has changed a lot (and not for the better but it might be just getting used to), and has a few things changed.
Positives:
+ I did like the small sub-goals, where you could accept challenges to increase your influence with foreign powers and factions on your island in a more logical way than the previous "random events".
+ Added faction "Loyalists" makes sense
+ Addition of foreign powers (Europe and China for instance) that don't give you aid but having a good standing does provide other benefits
+ Some interesting buildings added
+ Better warning system of inefficiencies (such as places not connected to roads etc)
+ Better disasters
Negatives:
- Not really a different game than 3. It's more a "Tropico 3 Mucho Macho Edition" than a Tropico 4.
- UI is "bigger and more console-y", which doesn't help with detailed views. In games such as these I want clear lists and graphs
- It appears you can't zoom out as far as you used to. I'm having a hard time checking out the entire island for resources.
- No more "Perks and flaws", but now it's one list where every flaw has perky side-effects. It's not balanced well, however.
- Upgradeable Perks?! It's not an RPG! Or is it?