From the experience I have with SDKs, I can tell you that: no, you will not need to worry, for a couple of reasons:
- Apple is well known to maintain backward compatible updates.
- The Map Kit API is encapsulated and it should not change at all.
- Even if the techniques of achieving maps and routes changes, Apple will still keep the same interface to access these functionalities.
- Most of low level functionalities of any SDK are encapsulated, their public interfaces (that we developers have access to) are stable and should not change.
- A break in these interfaces must be very difficult to even think about.
- Change the lower level of implementation will not change the public interface of the Map Kit API.
- Even if the interface changed, Apple will still leave the old interface and add deprecation metadata to them. These interfaces will still work, and other interfaces maybe added.
The only potential problems is that you will need to think about are when you are going to update your app, and that would be on whether to implement the new functionalities that the new Map Kit may provide.
