If I asked a stranger the question of the bus arriving and was met with the response of "soon enough", I would think that this person was annoyed either with me or with the bus driver. If I asked this question to a friend and was met with the same response, I would think that they must think I am being impatient. Generally, I think it is a pretty offhanded response to dismiss a question. I will say, however, that so much depends on the tone and context in which the response of "soon enough" is given. I hope this helps more than it confuses!

You're right that there is nearly always a negative overtone to this expression. Let's say you have a horrible boss at work. One day, you and your colleagues are chatting to a new colleague on her first day, and she says that she thinks that the boss is really nice and friendly. Afterwards, when she has left the room, someone says 'Do you think we should tell her the truth?', and you might say 'Oh, don't worry. She'll find out soon enough!'

Yes this is a good explanation. Correct!