Hello;
There are things i want to say as always. 
If i was the man who decides in TML Studios, i would leave all the things about new DLC or new game and do these things first:
1. AI Works:
a) AI Behaviour: This really needs to be improved, three games along with the Bus and still they are so behind of the rival game AI behaviours. They change lanes just in front of our vehicle, hit each other from behind while waiting at the lights (Accidens would occur but not everytime), hit your bus while coming to highway from the sideroad without checking and giving road, when you open blinker to change lane, suddenly they occur and no slow down at all (sure when you check distance and give blinker on time, i am driver for 14 years on roads). There are more things to write like stuck at intersections etc.
No takeovers truly. Especially single lane roads are fun to drive, sure in real life it is dangerous but in the game, we all wanna drive such exciting roads more than highways. However, we almost never come across any car in front to take over or cars behind us never pass our bus. Plus, there is always a traffic steam from the opposite lane in such roads, hard to pass.
b) AI Models: We never see a new AI model in the games, how many years left behind but still The Bus will come with the same AI models. There should be added new models, some old car models etc. Plus i don't like their colours, we don't see that much gold or light blue cars etc on roads, it would be better if better colours and also not like metallic colours. All look like that, also quality seems low. It becomes boring to see. Not so important for the base but for enjoy, it needs to be improved as detail.
2. Map Improvement:
It would be good to be able to select our route in the map. The roads we prefer to be selected. At least, let us select Break points/Restaurants so that navigation will draw the road. In such game, it is important feature and i am sure you can do that. It is not super extra wish i guess
3. Economy System:
We know that TML is working to bring a simple economy system already. It is so important to make the game alive. You said a simple one will come but it would be nice if it is a little good system to force us to select true route and bus options etc.
4. Sounds:
We know that TML is working on this issue, however, give it a little bit higher priority before any DLC or new game. It will be useful for the future too already.
5. Bus Physics:
Actually i am ok with the latest improvements but people still complain, so it can be improved a little bit more.
6. Live Cities
I actually don't care passengers come in or out of bus by walking but would be nice to see people in the cities. Another suggestion, put some signs on the stores in the languages of the countries. It gives more alive city atmosphere, like Butcher, Dream Fashion Store etc.
7. Flags:
Not something important 
But it annoys me, in 2020, the flags in the game seems so ugly and artificial, improve its look and animation please 
For now, this is what i am thinking, additions might be later :))
