I looked at the SDK changes and you are correct for WxWidget 3.x in that the API/ABI has not changed that I could see, but this is not the case for WxWidget 2.8. Does this matter or not? I have no idea what the right answer is, but just want to make sure you are aware of it in case it does mater.
In my case for Windows and Linux builds I use WxWidget 3.x so it will not affect me.